The 7 Best Hydration Packs of 2025

Best Overall Hydration Pack

Osprey Syncro 12

Bladder Capacity	2.5 L
Pack Size	12 L
Measured Weight	35.2 oz
Waist Belt	3/4" webbing

We loved the Osprey Syncro 12 right off the bat, which was only confirmed by our testing as this pack rose to the top across many of our test metrics. It has a versatile design, quality construction, and a thoughtful storage and organization layout. The back panel is breathable and comfortable and the hydration system is top-notch. We love the well-placed drinking hose release clip that makes filling and replacing the bladder a breeze, and the storage layout includes both well-placed pockets and plenty of overall volume for bulkier items like a jacket or sweatshirt. This pack doesn't show any significant weaknesses and exhibits the quality we've come to expect from Osprey products. One tester has been using this pack consistently for over a year without any noticeable wear or tear.

Although it is an all-around capable option, the Syncro 12 is not lightweight. Its quality construction and many features land it among the heaviest packs we tested. A comfortable carrying system compensates for this, but there are probably better and lower-profile options for fast and light pursuits. Check out the minimalist CamelBak Classic Light 70 if you want something lighter in weight (and lighter on the wallet). We also appreciate designs with zippered hip belt pockets, one of the only high-end features absent from the Syncro 12. Drawbacks aside, the Syncro earns our highest honor and a strong recommendation for its impressive job balancing storage volume, organization, carrying comfort, and hydration performance.

Read more: Osprey Syncro 12 review

Best Bang for Your Buck

Gregory Nano 18 H2O

Bladder Capacity	3 L
Pack Size	18 L
Measured Weight	25.6 oz
Waist Belt	Removable 3/4" webbing

The Gregory Nano 18 H2O earns recognition for its excellent value, offering ample storage volume and low weight at a surprisingly low price tag. This awesome pack has one of the larger storage volumes (18 liters) and water capacities (3 liters) in this category while still managing to boast one of the lowest weights and price tags. The simple, straightforward design makes it easy to carry bulkier items in the primary storage compartment and keep smaller items organized in the exterior zippered pocket on the top lid. The hydration system is painless to use and take in and out of the pack.

Unfortunately, the Nano 18 H2O sacrifices many of the premium features that some pricier models we tested offer. Given the affordable price, it's certainly comfortable, though the padded back panel is not as breathable as other models featuring open mesh panels, potentially leading to a hot, sweaty back. We found the large main storage compartment great for stashing bulkier items but lacking the detailed organization and storage capabilities that models with multiple interior pockets have, like the Gregory Endo 15L. Still, the Gregory Nano 18 outperforms many packs with higher price points despite lacking some higher-end features, and it offers an impressive value.

Read more: Gregory Nano 18 H2O review

Best Vest-Style Hydration Pack

USWE Rush 8L

Bladder Capacity	2 L
Pack Size	8L
Measured Weight	19.2 oz
Waist Belt	None

The USWE Rush 8L is a great option for those who dislike bulky packs or are looking for a lightweight, stowable option to more rigid packs. Weighing a svelte 19.2 ounces, this hydration vest's 8 liter capacity features a 2 liter bladder with five strategically placed storage pockets, three of which are on the shoulder straps and are easy to access during activity. While this pack is billed as a mountain bike pack, it was a great pack for shorter hikes and would even be worthy of consideration as an alternative to a top choice from our hydration pack for running review. The main compartment has a storage area and a sleeve for the reservoir. We were impressed at how much the storage area could hold, including a light jacket and a small first aid kit. The low back of the pack features a mesh storage pocket, which is a great place to stow additional essentials, such as bulkier snacks, tools, and sunscreen. The pack hugs the body, preventing too much jostling during activity. An elastic shock cord strap is found on both the left and right side of the vest under the armpits to adjust the fit across the chest, and two straps feed from the shoulder straps into the No Bounce Compression Compartment (NBCC). As you drain the bladder, you can tighten these straps to prevent the pack from moving around on your back.

The Rush 8L is comfortable to wear, depending on your build. Our main complaint, however, regarded the straps. It lacks a shoulder strap adjustment. Instead, it relies on shock cords for adjustments located on the sides of the pack; this can make getting the vest on and off tricky, depending on your shoulder flexibility and what clothes you have on. The vest clung to fleece versus slipperier materials during testing. We were also very aware of the straps while wearing the pack. If you find the strap design is a deterrent, we recommend checking out the CamelBak Classic Light 70, which features traditional shoulder straps and an adjustable sternum strap. You might also consider the Ultimate Direction Ultra Vest 6.0 if you prefer soft bottles on the chest instead of a hydration bladder. Despite the mesh straps, the pack also feels warm during activity. A size medium pack fits our primary female tester comfortably, but other female testers whose measurements fell within the size range for a medium could not wear the pack because it was too tight across the chest. We highly recommend measuring yourself and, if you're in between sizes, to size up for greater comfort.

Best Large Capacity Hydration Pack

Deuter Compact EXP 14

Bladder Capacity	3 L
Pack Size	14 L
Measured Weight	41.6 oz
Waist Belt	Padded with two zippered pockets

Smart storage and versatility earned the redesigned Deuter Compact EXP 14 top marks. With a 14-liter capacity, this pack provides plenty of storage and pockets to keep things organized and expands to 19 liters, making it a terrific selection for all-day adventures. Our testers are impressed with how supportive this pack is and how well it carries heavy loads. Features like a 3-liter bladder, pockets on the hip belt, integrated helmet storage, a rain cover, and mesh side pockets add to its value and versatility. In our testing, it proved comfortable and stable on mountain bike rides and hikes, and could even be used for snowsports.

The main downside to the Compact EXP 14 is its weight — all of those pockets and features add up, and this pack tips the scales at a whopping 41.6 ounces. Consider the CamelBak Classic Light 70 if you need a pack for going light and fast. Stuffing the side-load bladder back into its pocket when the pack is full can be challenging, and while the bite valve is not the easiest to drink from, it is well-constructed and includes a cover. All things considered, the Compact EXP 14 is an excellent option for anyone needing extra gear storage, and it earns high marks for its storage and comfort.

Read more: Deuter Compact EXP 14 review

Best Storage and Organization

Gregory Endo 15L

Bladder Capacity	3 L
Pack Size	15 L
Measured Weight	38.4 oz
Waist Belt	Padded with two zippered pockets

The Gregory Endo 15 is recognized for its outstanding storage and organization, boasting a large 3-liter 3D-Hydro water reservoir, a comfortable and adjustable suspension system, and a pocket or sleeve for every piece of gear. In addition to a large main storage compartment that houses the water reservoir and a removable tool pouch, this pack includes a front zippered compartment with a padded and lined sunglasses pocket, an external zippered valuables pocket, and zippered hip belt pockets. A ventilated back panel supports the cleverly designed storage features with moisture-wicking mesh and an adjustable Shift RS hip belt to help dial in a comfortable custom fit.

Unfortunately, all the impressive high-end features come with a weight penalty, making the Endo 15 one of the heaviest models we tested. The 3-liter reservoir offers plenty of capacity, but it is a bit trickier to access and remove than contenders with a separate reservoir sleeve, and its smaller circular opening makes refilling and cleaning more challenging than some of the other high-rated hydration systems. Check out the Evoc Ride 12L for a lighter weight and lower profile pack with a bladder that's easier to clean. Nevertheless, the Endo 15 is a terrific option for a heavy-duty hauler to help organize hiking gear, bike tools, camping equipment, or tools for fieldwork.

Read more: Gregory Endo 15 review

Best Drinking Hose Design

Thule Vital 6L

Bladder Capacity	2.5 L
Pack Size	6 L
Measured Weight	20.2 oz
Waist Belt	Padded with two stuff pockets

With its revolutionary ReTrakt drinking hose return system, the Thule Vital 6 left a significant impression on our testers. Every other top model tested features a hose clip or magnetic bite valve attachment, but the design's simplicity and performance remain unmatched. The drinking bite valve is conveniently housed along the right shoulder strap with a long, flexible magnetic strip, making it easy to grasp and reliably and securely returns when you release it. The Vital also provides a secure, comfortable fit without bouncing or flopping around with its lightweight pack design, low center of gravity, and wide hip belt and shoulder straps.

Our testers were uniquely impressed by the drinking hose return system outside the pack, but couldn't say the same for the slightly underwhelming reservoir housing inside the bag. The hanger loop and T-shaped reservoir hook are more tedious to work with than most other designs we tested, making removing and replacing the reservoir for refilling or cleaning a little more difficult. Even though it lands on the smaller side, the 6-liter storage is ideal for a day out on the bike and offers enough room to pack a jacket and all your gear essentials. If you need a bit more storage space but still want a lower-profile pack, we recommend the Evoc Ride 12L. Still, we think the Thule Vital is great for anyone who loves the convenience of a hydration bladder but is tired of the drinking hose always flopping around.

Read more: Thule Vital 6 review

Excellent Value for Minimalists

CamelBak Classic Light 70

Bladder Capacity	2 L
Pack Size	2 L
Measured Weight	14.5 oz
Waist Belt	None

For those who want an affordable, top-of-the-line hydration system without the need for extra storage or complicated features, the redesigned CamelBak Classic Light is an optimal choice. This pack is lightweight with a consistently reliable and easy-to-use hydration system, and it also has creative storage solutions that make it more versatile than previous iterations. A large front pocket is large enough to hold a wallet, keys, phone, snacks, and other small items, while side bungee straps allow you to stow a jacket or heavier layer, making this a great choice for the lightweight crowd.

The hydration system is easy to use, and the reservoir has a large handle that makes filling it even easier. While not the easiest-to-clean reservoir, the screw-top opening is large enough to easily accommodate a cleaning brush. For cyclists, there are two small pieces of webbing to thread a helmet through that act as a helmet carry and a tab to clip a light onto at the base of the pack. If you're someone who appreciates a well-designed, lightweight pack without a lot of frills, the CamelBak Classic Light is hard to beat and has an attractive price. Minimalists may also like the sleek Thule Vital 6L, which has a great magnetic hose system.

Read more: CamelBak Classic Light review

Compare Products

Compare select up to 5 products to compare

	Score	Product	Price
	73	Osprey Syncro 12 Best Overall Hydration Pack	$160
	72	Deuter Compact EXP 14 Best Large Capacity Hydration Pack	$120
	71	Evoc Ride 12L	$140
	70	Gregory Endo 15L Best Storage and Organization	$160
	67	Gregory Nano 18 H2O Best Bang for Your Buck	$80
	67	Osprey Skarab 18	$110
	64	CamelBak M.U.L.E. Pro 14	$160
	63	USWE Rush 8L Best Vest-Style Hydration Pack	$150
	62	Thule Vital 6L Best Drinking Hose Design	$140
	59	CamelBak Classic Light 70 Excellent Value for Minimalists	$75
	51	USWE Outlander Pro 2L	$110
	42	Teton Sports Oasis	$50

How We Test Hydration Packs

Our team has mountain biked and hiked California's coastal redwoods, Arizona's desert landscapes, and the Land of 10,000 Lakes, Minnesota, with these hydration packs. To begin our testing, we familiarized ourselves with each pack and its storage and hydration system. We then filled the pack with items we would carry on the trail and more to determine its capacity. We filled the reservoir, inserted them into the pack, routed the hoses, and headed out onto the trails. We drank from each pack as we hiked and biked while keeping notes on each pack's performance. We recruited other hikers and riders to use the packs and provide feedback on what they did or didn't like and why. Each hydration system was disassembled, cleaned, and put back together. We test each hydration pack based on metrics including drinking, filling, cleaning, comfort and storage capabilities, and overall weight.

Our test metrics for hydration packs include:

• Ease of Drinking (20% of score weighting)
• Ease of Filling (20% of score)
• Comfort (20% of score)
• Storage (20% of score)
• Weight (10% of score)

• Ease of Cleaning (10% of score)

Why Trust GearLab

To test hydration packs, we enlisted the expertise of gear testers Tara Reddinger-Adams, Nick Bruckbauer, and Jason Cronk. As experienced hikers, bikers, and all-around outdoors people, this group understands the importance of quality gear and efficient hydration. Tara has been testing for GearLab for nearly five years and calls Arizona home. She worked in the bike industry for 11 years and was a certified mountain bike coach and guide for over six years. She relies on gear that performs well on the trails, appreciates features that add functionality, and always listens to people's needs before making gear recommendations. You'll find her exploring on foot or on her mountain bike in search of new trails. Nick and Jason are longtime GearLab contributors and residents of the beautiful Lake Tahoe area, where they can be found shredding the trails all year via foot, bike, or skis.

Analysis and Test Results

We researched and analyzed the top hydration packs on the market and purchased carefully selected models from well-known and up-and-coming manufacturers. All the packs in our review come with a hydration bladder, drinking hose, hose routing system, and bite valve. While packs may look similar at first glance, differences in both the pack's and hydration systems' design affect their overall performance, such as how comfortable the pack is, the bite valve's ease of drinking, a reservoir's ease of cleaning, or how easy the reservoir is to fill. To help you identify which models excel and in what areas, we analyzed each backpack and hydration system design across six rating metrics.

What's the Best Value?

We do not factor price into a product's scoring but recognize that individual budgets vary and a product's value includes its price and performance. Products that cost less can sometimes perform just as well (or nearly as well) as those that are more expensive. We also realize that not everyone needs (or wants) every possible feature and that sometimes less is more, both literally and figuratively. We have compared both price and overall performance for each hydration pack tested to highlight each pack's performance features.

The hydration packs in our review all come with a hydration system and a backpack, which generally offer cost savings compared to purchasing each component separately. Some daypacks of similar size cost as much as the options in this review but don't include a hydration bladder. The Gregory Nano 18 H2O provides a 3-liter reservoir with a large storage volume and outstanding comfort at almost half the price of some high-end models. In contrast, the CamelBak Classic Light provides a top-notch hydration system in a minimalist pack design at a lower price.

Ease of Drinking

Since hydration is the primary purpose of a hydration pack, we focus our testing on the drinking performance of each pack's hydration system. We analyze each system's flow rate, ease of drinking, and how well the system integrates with the pack. Some packs have straps to help route the hose along the shoulder strap, while others feature a clip magnet to hold the hose in place and prevent it from bouncing around. Many packs also have a clip or strap that the reservoir hangs on inside the pack; this prevents the bladder from falling to the bottom of the pack and becoming crumpled as you drink from it. For this metric, we also consider the overall bladder volume and how easily we could drink from the bite valve.

The differences between how easily each model delivers the water became apparent during our testing, and we started narrowing down each brand's performance. We found CamelBak products are some of the easiest to drink from with their Big Bite valves, which deliver a flow of water that allows for easy drinking, while other bite valves require you to suck on them to get water. HydraPak hydration systems, such as those on Evoc packs and USWE Rush 8L, have a circular shape bite valve that is easy to drink from and provides a good amount of water.

Related: The Best Hydration Bladder of 2025

Some bite valve designs have a shut-off valve. This valve prevents water flow to the bite valve from the hose and is handy when transporting your pack by preventing accidental leaks. CamelBak's Crux Reservoir and the HydraPak reservoir found on the USWE Outlander Pro 2L pack both feature an on/off switch that flips and is easy to operate with one hand, even with gloves on. This feature is also useful when you tear a hole in the silicone part of a bite valve, and it begins to drip since you can easily turn off the water flow. In contrast, the bite valves on the Deuter Streamer 2.0 reservoir, Osprey Hydraulics reservoir, and the USWE Rush 8L Hydration Vest's HydraPak reservoir close by twisting the bite value. This process generally requires two hands and is more difficult to do while moving on the bike. In general, shut-off valves that only need one hand to operate are preferred.

The hydration system's overall design can greatly influence your drinking. Poorly routed hoses that kink or bite valves with a low flow rate can be frustrating. The same is true of having a bladder that is too small and running out of water. Here, packs with larger water reservoir volumes and better drinking hose attachment systems score higher. The Thule Vital 6 stands out with its innovative ReTrakt drinking hose return system that keeps the bite valve secure and easily accessible.

Ease of Filling

Filling a reservoir and fitting it back into the pack can be a chore, especially when the reservoir is difficult to use, or the hose needs to be rerouted through the shoulder strap. Luckily, many hydration systems have integrated quick-connect hoses. This button is located at a mid-point on the hose or where the hose connects to the reservoir, allowing you to remove the reservoir from the pack without undoing any hose routing. This feature makes removing and inserting the reservoir into the pack much easier. The Osprey Syncro 12 features a mid-point quick-release button that allows you to disconnect the hose before you remove the reservoir from the pack. Many models in our lineup also have a separate bladder pocket in the pack and wide-mouth reservoir openings that make removing, refilling, and replacing a breeze.

One of the most important aspects of this metric is the size of the reservoir's opening. Some reservoirs have quick release hoses and wide mouth openings that span the entire width of the bag, while others have screw-top lids built into the side.

Related: Best Backpacking Water Filters of 2025

Reservoirs made by HydraPak (found on Evoc and USWE packs), Osprey's Hydraulics reservoir, and Deuter's Streamer reservoir all have wide mouth openings. These openings run the width of the reservoir, are easy to place under a faucet to fill, and are large enough to put ice cubes into. This design is also the best for filling up in trickling streams (be sure to add a chemical treatment in the reservoir or an in-line filter to the hose).

CamelBak and Gregory reservoirs feature screw-top openings and integrated handles, making holding them under the faucet much easier. Our testers enjoy these integrated handles' support, especially as the water begins to weigh down the reservoir as it fills.

How important this metric is to you may depend on where you usually fill your hydration reservoir. Do you always fill from a kitchen sink? Do you ever travel and fill your reservoir from a shallow hotel sink? How about filling on the go from natural sources like lakes and streams? As water sources become less convenient, the convenience of the opening becomes more critical. The size of the reservoir opening can make a significant difference in the time and effort it takes to fill. A wider opening generally makes filling up easier.

The reservoir compartment design also impacts how easy it is to fill. If the pack has a small pocket for the bladder, placing a full reservoir into it can be an exercise in frustration, with a lot of shaking of the pack to get the reservoir into its pocket. Luckily, many packs have pockets that zip open wide, allowing a full reservoir to slide in easily. The USWE Rush 8L Hydration Vest and CamelBak Classic Light each have a zipper near the top of the pack to access the reservoir pocket. Other top-loading designs include the Gregory Endo 15, Evoc Ride 12L, and Osprey Syncro 12 which are easy to put a full reservoir into. Most of these contenders have dedicated hydration bladder sleeves, making the reservoir easily accessible, even when the bag is stuffed with gear.

Models such as the CamelBak M.U.L.E. Pro 14 and the Deuter Compact EXP 14 feature a side-load system, which entails unzipping the side of the pack to access the bladder. When the pack was full, inserting a full bladder into a side-load design was more challenging for our testers. The minimalist USWE Outlander Pro 2L is designed to carry water and not much else and has a small reservoir pocket. In our testing, we had to shake the pack to get a full 2 liter reservoir inside. The easier it is to refill your pack, especially during a hike or ride, the easier it is to ensure you drink enough water to stay hydrated. With most of today's pack designs, there is no need to dump your pack's contents in frustration to refill your tank.

Comfort

A pack's level of comfort includes several factors. One of the first things we looked at was the intended use of all our test packs. Is the pack designed to carry water and not much else like the CamelBak Classic Light or USWE Outlander Pro 2L? Is it intended to carry and organize your mountain biking gear like the Evoc Ride 12 or Gregory Endo 15? Is it designed to fit like a vest, like USWE Rush 8L Hydration Vest is? Or, is it designed for all-day adventures like the Osprey Skarab 18 or the Deuter Compact EXP 14? In some packs, such as the CamelBak M.U.L.E. Pro 14, you can add back protection for mountain biking, making them even more activity-specific. Considering how you will use your hydration pack will help narrow your choices and is an important step in your hunt.

Loading down an ultralight pack with too much weight can diminish its comfort. Conversely, a large pack may be overkill if you carry minimal items and only partially fill your hydration bladder. Having too large of a pack isn't necessarily uncomfortable, but its contents may shift around more during use than in a smaller pack. These factors can decrease your comfort, and the size and weight of items you carry should be considered when looking for a new pack.

We kept our comparison loads similarly weighted during testing. We typically carried a medium-sized first aid kit, a wind jacket, two liters of water, some snacks, a lip balm, and a cell phone for hiking. On certain occasions, we also lashed our trekking poles to the pack. We carried those same essentials on mountain bike rides, plus multitools and a small bike repair kit. Beyond these staple activities, we also used the packs as a multipurpose pack and while walking the dog. The smaller models we tested did not have the capacity for all these items, but the 8 liter and larger models we tested proved versatile and could be compared while carrying a more substantial load.

Next, we looked at each hydration pack's overall construction and tested how it supports and carries a load. Each model in our lineup has one of three basic foundations: No frame, like the USWE models and the CamelBak Classic Light, a stiffened foam frame sheet, like our value-oriented Gregory Nano 18 H2O, and a light wireframe like the high-end Osprey Syncro 12.

Packs without a frame are more comfortable with lower weights and tend to slump and cling to your back as you add weight. Packs with stiffened foam or wireframes distribute weight better and are more comfortable. We were pleasantly surprised at the support we felt when we loaded the Osprey Skarab 18 up with a full day's backcountry gear and started hiking. It doesn't provide the degree of support a specialized ski pack does, but it isn't explicitly designed for that. The Deuter Compact EXP 14 is made for larger loads. It expands up to 19 liters and handles the additional weight quite comfortably.

We also tested these packs for breathability as this affects your comfort quite a bit (think a sweat-saturated back on a chilly and windy day). The wire-framed Osprey Syncro 12 and Deuter Compact EXP 14 with their Airstripes and AirMesh lining provide the best ventilation designs. They offer high levels of breathability by keeping the pack's main body away from your back, allowing for greater airflow. The Gregory Endo 15 also provides decent ventilation with comfortable back panels separated from the backpack's body. However, packs that lack a wire frame, such as the CamelBak Classic Light, USWE Outlander Pro 2L, and USWE Rush 8L Hydration Vest all sit directly against the back, preventing airflow and leaving us sweaty.

Shoulder strap construction is another important consideration when it comes to comfort. Much of the pack's weight rides on your shoulders, especially for models with no hip belt or a skinny webbing belt. Shoulder straps with a more anatomic cut are more comfortable. During our testing, we found the shoulder strap design of some packs to be uncomfortable and too tight for people with larger torsos. Ultimately, the higher-priced packs in our lineup tend to have more adjustability and ergonomic designs that are more comfortable for a wider range of body shapes.

Most packs in our review use a traditional shoulder strap, which you can tighten by pulling on the lower part of the straps, generally allowing various body types to achieve a comfortable fit.

USWE separate themselves utilizing their patented No Dancing Monkey™ harness, whose buckle is in the middle of the chest. The USWE Rush 8L has no shoulder strap adjustment and instead adjusts with elastic shock cord straps on the sides of the vest. For this pack, you must measure your chest and use their fit guide to ensure a proper fit. In our testing, we found the fit of this design to be highly dependent on the shape and size of one's torso, and some of our female testers experienced a less-than-desirable fit. The harness on the USWE Outlander Pro 2L adjusts with dual Velcro loops at the bottom of the strap, but there is no adjustment for the strap that fits over the shoulder. Our female testers could not comfortably wear the USWE Outlander Pro 2L. No matter the adjustments, the buckle sat towards the top of our sternum, and the straps smashed our female testers' chests, making it very uncomfortable to wear. However, male testers found the pack generally comfortable.

Some hydration pack users prefer a more substantial hip belt like the Thule Vital 6 and Deuter Compact EXP 14, while others have no hip belt, like the USWE models, which rely on their No Dancing Monkey™ harness. Others use a slightly wider, larger webbing design, like the Evoc Ride 12, while still others have a thin hip belt, like the Osprey Syncro 12 and Gregory Nano 18 H2O. What type of waist security you prefer is very subjective, and only you can decide which style you like. Generally speaking, the more substantial the hip belt, the more comfortably the bag will carry heavier loads.

Storage

A pack's comfort is a cocktail of individual ingredients, while storage space is more straightforward. Are you only carrying water? Do you regularly carry extras in your pack, like snacks, first aid, and an extra layer? How about carrying tools, emergency gear, and other items for remote or all-day adventures? Depending on your typical day out and what you bring, it's relatively easy to figure out how much space you need.

Once you've decided on the best size, you can begin narrowing down how you want your storage space organized. Do you prefer one large opening to stuff all of your contents into? If so, the Gregory Nano 18 H2O may be the ticket with its basic sack-like style. Are you someone who loves to have everything in its compartment or pocket? Some packs even have loops to hold your bike pump in place, pad and helmet carry straps, integrated rain covers, and lots of interior pockets. If this is your style, our midsize bike packs, such as the CamelBak M.U.L.E. Pro 14, the Gregory Endo 15, and the Osprey Syncro 12 can be great choices.

We were especially impressed with the storage features on the Gregory Endo 15 and Deuter Compact EXP 14. The Endo has 15 liters of overall volume, lots of storage compartments, zippered pockets, padded sleeves, and hip belt pockets. The EXP14 also has loads of pockets, and its main storage pocket can expand by a full 5 liters, making it a great choice for all-day outings. We also like the easy-to-use storage compartments in the Evoc Ride 12, whose rectangular shape is easy to stuff with first aid and extra layers.

Weight

At GearLab, we measure an item's weight since sometimes claimed weights aren't always accurate. Our lineup of hydration packs is no exception. We weighed each pack on a kitchen or handheld luggage scale with its included hydration system to get our listed weights.

The packs in our review range from lightweight minimalist models to those for all-day excursions, and their weight reflects those differences. Some of the lightest packs in our test include the CamelBak Classic Light at 14.5 ounces, the USWE Outlander Pro at 17.6 ounces, and the USWE Rush 8L Hydration Vest at 19.2 ounces. Of these sub-20-ounce packs, the Rush 8L stands out due to its 8 liter carrying capacity, which is 6 liters more than the Classic Light and Outlander Pro.

The fully-featured Deuter Compact EXP 14 is at the opposite end of the spectrum, which tips the scales at 41.6 ounces. This pack is expandable to 19 liters and has enough storage for all-day adventures. The Evoc Ride 12L came in at a respectable 24 ounces, and the Osprey Skarab 18 at 25.5 ounces.

With its simple, lightweight design, the CamelBak Classic Light scores well in this metric. If you carry just the bare necessities and don't need more than 2 liters of water, this pack is an excellent choice and is comfortable whether you're a cyclist, hiker, or runner. It has shock cord straps and a storage pocket on the pack's main body for added storage and versatility. It's also an excellent choice for kids, keeping the pup hydrated, or occasional hydration pack users.

How much emphasis this metric has on your hydration pack decision-making is up to you. Some riders and runners want things as light as possible, whereas others don't mind an extra few ounces or even a pound if it means their pack is more organized, comfortable, and has more bells and whistles.

Ease of Cleaning

Cleaning your pack's reservoir is generally the last thing you want to do when you get home, and many of us don't clean our reservoir as often as we should. The reservoir's design can make cleaning easier. Wide mouth openings allow you to easily insert a brush or hand into the reservoir to scrub it out and help prevent mold and bacteria from overtaking your reservoir.

Features like quick-connect hoses also make it easier to remove and clean the reservoir, hose, and bite valve (where mold seems to thrive). The reservoirs with the widest opening mouths were those made by Deuter and HydraPak, whose reservoirs are found in the Evoc Ride 12 and USWE packs, and those found in the Osprey Skarab 18 and Syncro 12. Their wide openings make it easy to insert your hand or bush, scrub, and dry. Once you do it, you realize that keeping the bladder clean is pretty darn easy. Cleaning the hose requires a specialized thin brush, but removing these bite valves and scrubbing them or soaking them to remove bacteria is easy. HydraPak reservoirs found on Evoc, Osprey,and USWE packs can be turned inside out to clean. For those that are dishwasher safe, you can toss them inside out in the top rack and let the machine do the work.

The narrower the opening, the more of a task cleaning becomes. The packs equipped with CamelBak Crux reservoir fill easily but are harder to thoroughly clean and dry than the models mentioned above. That's not to say they were that difficult to clean; they just require a brush or small hand and a bit more effort than the other wider opening models. The reservoir found in the Teton Sports Oasis and the 3D-Hydro system reservoirs on the Gregory Nano 18 H20 and the Endo 15 require a little more effort, with smaller circular openings requiring the right size brush to clean.

How To Choose a Hydration Pack

We've put together four important buying considerations, including size, features, and water capacity, to help find the right pack to keep you hydrated and comfortable on your next adventure.

What's Your Intended Use?

Hydration packs come in various sizes and can be activity-specific. Day-hiking packs are designed to distribute loads comfortably and may include activity-specific features such as straps for carrying trekking poles. Mountain bike-specific packs generally have compartmentalized storage for tools, pumps, and more. Running packs are designed to minimize bounce and allow easy access to food thanks to pockets on the shoulder straps. When choosing a hydration pack, consider your typical activities and how you'll use the pack. Choosing a pack that aligns with your activities will ensure your pack fits properly and has the necessary features for your adventures. And remember, just because a pack is designed for one type of activity does not prevent it from being used for another.

How Much Water Do You Need?

It's important to consider how much water you need on a given day. If you typically go on shorter hikes or rides, a 1.5-liter reservoir can work well but may be limiting for longer activities or in hotter climates, where a 3-liter reservoir is preferable. If you'd prefer to get more versatility out of your pack, you can always partially fill your bladder, but typically, a larger bladder means carrying a larger volume pack. When buying your next hydration pack, consider your typical water intake and the tradeoff between extra water or a lighter pack. Some packs have side pockets large enough to stow a water bottle for increased hydration needs.

How Much Gear Do You Carry?

Hydration packs come in sizes ranging from 2 liters upwards of 50 liters. Deciding on the right size pack will also depend on your activities and time spent on the trail. Smaller packs are great for traveling light or for carrying minimal stuff like a light layer and some energy bars. On longer rides, hikes, or overnight trips, a larger pack is necessary to carry extra layers, food, and emergency items. To decide on the right pack size, consider your must-have items and any extra gear you think would benefit your activity of choice.

What to Look for in a Comfortable Pack

Being miles away from the trailhead with a sore back and shoulders is a situation no one wants to find themselves in. Finding a comfortable pack means taking into consideration your torso shape and size. Some packs feature adjustable shoulder straps, while others may not. Padding in the shoulder straps can improve comfort, as can wider hip belts. Also, consider if the pack has a support system, such as a wireframe, to help support larger weight loads. Ventilation is also important, especially in hot climates, so keep an eye out for packs with mesh backing or ones designed to sit away from your back.

Conclusion

The process may seem overwhelming with so many hydration packs on the market and specialized options available. Our goal is to provide the best research, detailed testing, and helpful tips so that you can find the best hydration pack for your needs.