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We bought and tested 15 of the best water bottles through side-by-side assessments to evaluate taste, insulation, and closure functionality. Our evaluation combined lab-style measurements with how well each bottle design fits into our everyday lives, whether filled with water, electrolytes, tea, or coffee.
The Hydro Flask Wide Mouth with Straw is the best option for most people due to its excellent closure, ergonomic design, and top insulation test scores. The Iron Flask Insulated, while slightly behind in insulation and material quality, is lighter and nearly half the cost.
While most people will be satisfied with either of these two options, please read below to discover our recommendations for the best glass bottle (for superior taste and reduced plastic usage), the top filter bottle, and the best collapsible bottles.
The Hydro Flask Wide Mouth with Straw is our favorite everyday water bottle, scoring high marks in our test metrics. It's impressively well-insulated, and the water stayed cool even when the bottle's exterior was warm. It has one of the best feature sets of any bottle in our review. Jon Oleson, one of our testers for this bottle, states that the open mouth and simple construction make it “easy to fill and clean.” We love the easy, breezy flip-up straw cap. And with a comfortable handle, you barely need to lift a finger to tote it around.
Our main issue with the Hydro Flask is the fairly low volume capacity. If you drink a lot of water, this 24 oz model may be limited, which can become problematic on longer hikes or days out on the lake. There are larger versions, but they don't fit as easily in a car cup holder. Another drawback is that the straw is plastic. When we filled the bottle with hot water, we could taste the plastic, so it lost a couple of points in our taste test. If taste (or just avoiding plastics) is your top priority, go with a glass bottle like the Purifyou Premium Glass. We loved toting it around town and even on day outings, but you'll probably select something more voluminous and lighter for backcountry travel. If insulation and taste are a higher priority for you, the Klean Kanteen TKWide Recycled Insulated scored higher in those two metrics and just a point behind the Hydro Flask overall. It has the option of a metal straw, which helps in the taste department. If you are looking for the best value, consider the Iron Flask Insulated, which scores only a few points behind the Hydro Flask, is lighter, and half the cost.
If you're looking for a bottle that stands out aesthetically, look no further than the Iron Flask Insulated bottle. The attractive designs and glossy finish make for a flashy walk down the runway (or trail). “At first glance, you wouldn't think this is the budget option,” says our tester. The durable plastic cap has an ergonomic carry handle with a carabiner-like clip, making it easy to lug. The flip-up straw design on the lid makes for quick and easy sips, promoting our hydration. We were happy to carry this bottle around, especially considering how cool it looked. It's also nearly half the price of similar insulated bottles.
One downside of the Iron Flask is the plastic straw. We noticed we could slightly taste the plastic when our water got warm. The straw attaches to the cap via a silicon receptacle, which we also found to be a potential weak point for wear. Unless you want the color to fade, you must hand wash this bottle due to the finish. This bottle was one of the lightest weight insulated models we tested, but the thinner materials also resulted in the lowest insulation in that category. This water bottle is terrific and performs well in the daily grind or at the gym. However, we reached for one of the more durable and less flashy bottles for longer treks in the bush, where this bottle could take a beating. If insulation is a higher priority for you, the Owala FreeSip Insulated performed better in this metric and only cost a few dollars more.
If you prefer glass, you'll want to check out the Purifyou Premium bottle. The thick glass has a rounded lip that's satisfying and almost sensual to sip, making drinking from it a pleasurable experience. The premium glass cleans well and doesn't hold onto flavors. There's no chemical leaching, and the water tastes just as clean from this vessel when it's warm as when it's fresh. The protective rubber sleeve makes it slightly more whoopsie-proof, and it comes in various colors (including glow-in-the-dark), although it is still glass, so don't push your luck. The cap threads are well made, and it spins open with a satisfyingly smooth whirl and clamps down tight due to a rubber gasket under the lid. It also sports an ergonomic finger loop that makes it easy to carry.
The biggest disadvantage is the small mouth, which makes cleaning more challenging. Therefore, we recommend investing in a good bottle brush (Purifyou sells them on their website). Remember that this model is not insulated, so you'll want to keep it out of the sun if you want your water to stay cool. The water inside this vessel reached up to 110 degrees Fahrenheit (at 81F ambient temperature) in our 6-hour sunbaked bottle insulation test. Also, did we mention that it's glass? That means you'll have to be more careful handling it than other, more durable plastic and metal models. The Purifyou is best for folks seeking an alternative to plastic and serves as a great indoor water bottle for the office. This water bottle dramatically outscored the Lifefactory Glass Active Cap, the other main glass contender we reviewed.
For the second year running, this bottle takes the best filter prize. The Brita Stainless Steel Filter Bottle is sleek, leakproof, and well-insulated. There are multiple color options, and the lid's design makes it easy to clean. The silicone bite straw has a nice shape and texture. This bottle's flip cap is the most effective and functional of the bottles we tested with this feature. It's lightweight and light on the wallet compared to others in the category. Before testing, we didn't even realize how useful a filter bottle could be to everyday life.
The two main issues with the Brita are its size and lack of versatility. The 20 ounces of water goes fast if you're big on hydrating like us, though this bottle is also available in 32 ounces. Since it's a filter bottle, we hesitated to put any flavoring into it to avoid contaminating the filter. Another noteworthy consideration is that the charcoal filter in this bottle doesn't remove bacteria, viruses, protozoa, or heavy metals. Instead, it merely reduces chlorine and particulate matter. So, this is a great bottle to use at the gym, work, or any place with municipal (treated) water to remove the chemical taste.
Like grandma's Buick, the Nalgene Wide-Mouth is a classic. And just like grandma's Buick, it's big and clunky without many bells and whistles. However, the bottle many of us grew up lugging around in the backcountry has been upgraded with some environmental considerations. The new Nalgenes use 50% recycled material and are now BPA-free. You get the same lightweight, wide-mouth container that holds hot and cold liquids without holding onto the flavors (mostly) for the same value, and you can walk around enjoying the great outdoors knowing that you're doing your small part to help reduce, reuse and recycle.
What the Nalgene won't do is keep your cold liquids cold or your hot liquids hot for very long. There's absolutely no insulation on these bottles. The container is nearly shatter-proof, but it's not very thick. Neither does it have a fancy straw, rubber gaskets, or a flip-up spout. It's a simple (recycled) plastic container with a simple plastic lid: all container and no frills. However, if you need a versatile, lightweight container to lug around liquid on your next backpacking adventure, consider this bottle (or two for the price!). If you want a better option for ultralight backpacking, it's hard to beat a 1-liter wide-mouth soda or sports drink bottle for the weight and price. But on those hot days when your bottle is basking in the sun, consider bringing an insulated model along for the adventure, like the lightweight Iron Flask Insulated. As a bonus, it includes a built-in straw.
Plastic is certainly the convention when it comes to bike bottles. The Speedfil Speedflask opened our minds to the benefits of metal. Firstly, it retains cool liquids for much longer than plastic bottles. The stainless steel construction lends to durability and longevity. We were also impressed by the one-handed functionality of the push-button flip cap. Once open, the mouth is a spout, so it's easy to hydrate and stow quickly. There's also a sleek and convenient carry handle that clips down and out of the way when not in use.
With the heavier materials, the strength of the Speedfil may also be a weakness if you're counting ounces. Your average rider may not notice, but an avid racer might want to reduce weight. The quality materials also cost more money. Although, as long as this bottle lasts, you may cycle through a few plastic ones. While the push button flip cap is nice for quick hydration, it also produced some leakage in our lid test. This likely isn't an issue when taking turns on the trail, but this wouldn't be our first choice to throw into a daypack making it less versatile than other leakproof bike bottles. That being said, the quality of materials, superior insulation, and ease of use make this our first choice for our two-wheeled adventures. If weight is super important and you want a more traditional bike water bottle, check out the CamelBak Podium Dirt.
The Speedfil Speedflask slips in and out of a water bottle holder with ease, making hydration on the go easier.
Credit: Jon Oleson
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This year's contenders for best filter bottle being tested side by side down at the river
Credit: Jon Oleson
How We Test Water Bottles
We've tested nearly 80 individual bottles since 2015. We constantly monitor the market for new and innovative designs and have seen many trends come and go over the years. First and foremost, these products must be easy to use, and we rated our ergonomics metric on factors like carrying handles, ease of filling and cleaning, and whether they fit in a car cup holder. We also passed these bottles around to our friends and family to ensure we got plenty of varied input. Water bottles are as much about personal preference as holding water. We filled them with hot water and let them sit to determine whether or not materials leach to impart undesirable flavor (think of a water bottle left in a hot car). We filled them with blue-dyed water and left them on their sides on clean sheets of paper overnight to look for any signs of leakage. We examined their compositions and moving parts to determine their weak points and strengths. We combined this feedback and field testing with some objective tests to provide extensive information so your next water bottle purchase can be well-informed.
Our water bottle testing uses five rating metrics:
Closure (25% of overall score weighting)
Insulation (25% weighting)
Taste (25% weighting)
Ergonomics (15% weighting)
Material Quality (10% weighting)
Why Trust GearLab
Everyone drinks water, but not everyone takes hydration as seriously as our lead bottle testers, Jon Oleson and Jane Jackson.
Jon is constantly moving between the garden, the crag, the trail, the river, and plane rides here or there. Whether working in the field, at the playground with his kids, or airport hopping, Jon knows that clean H20 is the foundation for all life. Having the right vessel for the right situation is also important. Jon has tested these bottles over months--in the backcountry, hydrating (and sharing a bottle with) sick kids, in the garden, on road trips, and everything in between. These varied situations have allowed Jon to hone in on each bottle's strengths and weaknesses and determine the right bottle for your specific needs.
Jane has spent months of her life drinking from and assessing the performance of the most popular bottles on the market. First and foremost, Jane is a rock climber, a hobby that forms the foundation of her life and has led her to cliffs, big walls in Yosemite, and valleys around the world. Most of the testing of these bottles took place at the crag, in boulder fields, on long hikes, or rest days at cafes and coffee shops across the globe. These varying situations have provided excellent opportunities to test the portability, durability, ease of use, and overall performance of the water bottles seen in this review. Because she is constantly traveling, Jane rarely drinks from a traditional drinking glass in a kitchen, making her an expert at hydration on the go.
We tested how easy each bottle lid is to wash, among many other aspects of use.
The carabiner on the Lifestraw Go conveniently clips to any loop making it easy to carry.
Our field of testing included long commutes, longer work days, short day hikes, windy bike rides, and even fun time at the park with our kids.
Analysis and Test Results
We used five different rating metrics to assess each bottle in this review. Although the type of bottle (e.g., filter bottle, insulated bottle, bike bottle, etc.) separated them somewhat into categories, the overall review objectively compares bottles of all different types side-by-side. That said, use your discretion when reading this review. A stainless-steel bottle will be more durable than a glass one, while the most insulated bottle may not be the best fit for your next backcountry adventure. Determine your specific lifestyle needs as you read about each bottle's unique characteristics.
Today, some of the most popular options are stainless steel bottles, including vacuum-insulated and uninsulated. Next, there are the classic plastic bottles, all of which are made from BPA-free plastics. We tested collapsible and glass bottles, as well as bottles offering different methods of filtration. Each bottle has its intended use(s) — and we discuss which situations work best for each bottle in the individual gear reviews.
What's the Best Value?
Many like to consider cost alongside performance no matter what your specific needs. We focus on performance when we score products, and we appreciate a good deal as much as anyone else. The price gap of water bottles can be vast; stainless steel and glass bottles will typically cost the most. That said, over the past few years, we have seen a growing selection of affordable bottles made of these materials.
This year, the Iron Flask Insulated takes the prize as our go-to in terms of value, though the Nalgene Wide-Mouth remains a top consideration as well. The Iron Flask is attractive and lightweight, plus its straw-style lid promotes hydration more readily than a standard wide mouth. That said, if you aren't a fan of a straw-style lid, the Nalgene's simple and classic design is a time-tested favorite for a reason. Another decent option in terms of price is the Camelbak Chute Mag Renew, which is a simple, lightweight plastic bottle with a twist-off spout.
The Iron Flask Insulated bottle is a great option if you're shopping on a budget, although due to its flashy graphics, you wouldn't believe that it's one of the most affordable at first glance.
Credit: Jon Oleson
A great value option if you do not want plastic is the Lifefactory Glass Active Cap. This bottle is the most affordable glass option in our lineup and features a pop-up flip cap with a rubber bubble seal. The Brita Stainless Steel Filter Bottle is an award-winning option most suitable for professional settings and is the most inexpensive of the filter bottles.
There are many reasons to get a reusable water bottle. Some will cite health reasons, and the National Institute of Health cites that an average liter water in a plastic bottle contains an average of 240,000 tiny pieces of plastic, 90% of which are nanoplastics. Interested in the environmental value of long-term over single-use water bottles? Sip on this — when the National Park Service banned the sale of single-use plastic water bottles in just 19 parks, they eliminated the purchase of up to 111,743 pounds of PET (plastic), prevented the emission of up to 141 metric tons of carbon dioxide, and saved up to 419 cubic yards of landfill space per year. The report is available online. Unfortunately, this ban on plastic water bottles was rescinded in 2017.
Closure
This test was broken into two parts—one objective and one subjective. The first, which was the bulk of the score in this category, was the “leakproof test.” That is, how much the water bottle leaked when left on its side with the lid closed. We filled each water bottle, added a few drops of blue food coloring, closed the lid tight, and left it tipped over on a clean white sheet of paper for a night and a day. With some, it was apparent that they failed after the night was through. Others leaked after the room in which they were sitting heated up for the day, building up pressure in the bottle. There were also observations in the field. For example, one particular bottle passed the controlled test with flying colors but then leaked its contents into our bag and ruined two headlamps.
For the leakproof test, water bottles were filled with blue-dyed water, closed tight, and set on their side for 24 hours. At the end it was clear to see which were leakproof and which emptied some (or all) of their contents.
Credit: Jon Oleson
The second part of this test was how easy the closure, whether it be lid, straw, or cap, was to use. Could it be operated one-handed, or did it take two hands? Was it quick and easy to flip up the straw and hydrate, or was the process more involved? The highest scores were given to the bottles that allowed for the quickest and easiest hydration.
The Speedfil Speedflask is true to its name. We found it quick and easy to fill mid-ride.
Credit: Jon Oleson
Some bottles were really close on this test. Two of our highest-scoring bottles, the Hydro Flask Wide Mouth with Straw and Iron Flask Insulated, were hard to tell apart in this regard. Both retained all their liquid on the leakproof test, and their flip-up straws were easily operated with one hand. In fact, the Hydro Flask became the kids' favorite because it was so easy to operate, and they liked the color. The Brita Stainless Steel Filter Bottle bottle was also extremely easy to operate one-handed, simply with the push of a button. The Speedflask also has an easy push-button flip cap but was taken down a notch because it did not prove to be leakproof during that portion of the test.
The kids loved the Hydro Flask for its easy to use flip straw and bright color.
Credit: Jon Oleson
The majority of contenders contained their contents during the leakproof test, but not all were as quick or easy to operate and thus did not score as highly. The Owala Freesip has a clip over a push button flip cap, which is great for guaranteeing that the flip cap stays closed, and we found it to be a bit cumbersome. The Yeti Rambler, Purifyou Premium, LARQ Bottle PureVis, and Camelbak Podium Dirt all retained their liquids, and all require two hands and an amount of twisting to take off the cap and sip. Despite the extra twisting, all these bottles have their specific features and uses, so it's good to note that they won't leak on you.
Although the closed cap didn't leak, the Brita's straw did leak inside the cap during the leakproof test.
Credit: Jon Oleson
There were those bottles that were quick to hydrate but didn't pass the leakproof test, like the aforementioned Speedflask. The Lifefactory Glass Active Cap is super easy to flip and chug, yet emptied almost all the bottle's contents during the course of the leak test. One of the highest scoring bottles in many other regards—the Klean Kanteen TKWide --is quick to hydrate with a two-handed half twist, but it leaked a decent amount during controlled testing (although none was noticed during field testing). If you're planning on mindlessly tossing your bottle into your pack, you may want to consider one of the more leakproof options mentioned above.
The Lifefactory Glass Active Cap emptied nearly all of its contents during the leakproof test, turning the entire paper blue.
Credit: Jon Oleson
Lastly, there were what we would classify as the “backpacking bottles” that both produced a bit of leakage on this test. The Nalgene Wide-Mouth leaked just a bit on the leakproof test, and the gasket-less lid is the classic twist on/off type. The Grayl GeoPress Water Filter and Purifier has two chambers—the bottom one you fill with unfiltered water, which is then pressed into the upper, filtered chamber. The upper chamber has a tight-fitting lid and screw cap with gaskets, which do not leak. We found that the lower chamber does leak, however, and not all the water presses into the upper chamber. This is an inherent design flaw in this otherwise very useful filter press that we were happy to have with us on several occasions despite the added weight.
The Grayl GeoPress has an outer container that you fill with untreated water and an inner chamber with a filter that you press into the outer container. The filtered water fills the inner chamber and can then be transferred to other vessels.
Credit: Jon Oleson
Insulation
When you fill your water bottle with cold water on a hot day, you probably want it to stay cold. In this test, we measured the insulative quality of the bottles under the hot California sun during midday. Each bottle was filled with cool water from the tap and then set on the grass in the sun. We measured the water temperature inside the bottles every 30 minutes for 6 hours.
There was quite a disparity between the insulated and the non-insulated bottles. The insulated bottles saw a modest temperature increase, while some of the non-insulated contenders reached temperatures 40 degrees above the ambient air temperature. We also saw a decent range among the insulated bottles. The quality and thickness of materials, as well as design and construction, seem to make a big difference in insulative quality.
A comparison of the insulation offered by each water bottle we tested.
Credit: Ross Patton
In the insulated bottle category, the Klean Kanteen TKWide, Brita Stainless Steel Filter Bottle, and Owala FreeSip showed to be the most insulative. These were closely followed by the Hydroflask Wide Mouth with Straw,Yeti Rambler, and the Speedfil Speedflask. Any of these bottles would be good options to preserve ice on a hot day.
During the insulation test, water bottles were filled with cold tap water and set out under the sun for six hours. The temperature of the water in each vessel was measured every 30 minutes.
Credit: Jon Oleson
The Brita Stainless Steel Filter Bottle and Klean Kanteen TKWide were neck and neck for most of the test. Over the six hours, the Brita's water temperature rose just 8.5 degrees F. The Klean Kanteen's rose just 9.4 F. This is quite impressive considering they were both in full sun on an 80-degree F summer day.
From left to right, the Kleen Kanteen TKWide, the Waatr Crazy Cap Pro (previously tested), and the Brita Insulated Filtration bottle were the 3 most insulated water bottles, according to our test.
Credit: Jon Oleson
If you're in the market for a plastic bottle, then you'll be interested to know that the water inside each of the plastic bottles reached over 100 F during the test, with the exception of the Camelbak Podium Dirt bike bottle (which reached 96.8 F). This highlights the fact that if you're toting plastic, then it's best to keep it out of the sun. At least you can rest assured that companies are taking environmental health into consideration and making plastic bottles out of materials that don't leach BPA, BPS, BPF, phthalates, and other known carcinogens into your water.
The Camelbak Podium's insulation is a foam-type material in between layers of hard plastic. While it's technically insulated, we found that it was sub par when compared to the vacuum sealed metal options.
Credit: Jon Oleson
There was a slight difference between the glass bottles in terms of insulative quality. Our top pick for glass bottles, the Purifyou Premium, got up to 110 degrees F! While the Lifefactory Glass Active Cap only reached 95 F. Either one is still hot when you go for a cool sip, but 15 degrees is a noticeable gap. As with plastic bottles, it's best to keep the glass out of the sun if you want your water to stay cool.
We toted the Purifyou Premium along on outdoor adventures, but it tended to heat up in the sun.
Credit: Jon Oleson
If you're in the market for a collapsible bottle, our testing has shown that these styles are some of the worst at insulating under direct sun exposure. The 17 oz Hydrapak Stow reached a sweltering 123 degrees F.
The soft plastic bottles were the most lightweight, and they also heated up the most in the sun, lending an undesirable plastic taste. If you're going to use this type of bottle, it's best to keep it out of the sun.
Credit: Jon Oleson
Taste
It's essential to stay hydrated, and you're probably more likely to do so if the water you're drinking tastes good. No one likes to go for a warm bottle of water and taste the plastic. Yuck! Chemical leaching. In this test, we filled the bottles with 100-degree water and let them sit to simulate a bottle left in a warm car. We then tasted the water from each bottle to determine which ones did or did not impart taste.
Preparing bottles for the hot water taste test.
Credit: Jon Oleson
Our main reviewer is really sensitive to plastic taste and smell, so we were able to hone in on not just the differentiation but also the elements that contributed to the difference. The highest scorers in this category were the bottles that had no plastic touching the water. These were generally metal containers without plastic straws and the glass bottles. The Klean Kanteen TKWide was the only container with a straw that did not impart a plastic taste because its straw is also stainless steel. The top-scoring metal bottles with plastic straws, like the Hydro Flask Wide Mouth with Straw and the Iron Flask Insulated, only imparted the slightest plastic taste—perhaps not enough for most people to notice, especially if you're drinking cold water from them.
We were really impressed by the Kleen Kanteen TKWide's metal straw, which makes it a gem among water bottles. The straw is easy to clean and has an excellent flow rate.
Credit: Jon Oleson
The glass bottles and metal vessels without straws all scored very highly, with a clean, chemical-free taste. Any one of these bottles—the Purifyou Premium, Speedfil Speedflask, Lifefactory Active Cap, LARQ PureVis, or the Yeti Rambler—is a good choice if your only focus is clean-tasting water.
Metal vessels produce a clean taste but also have a tendency to absorb flavors from sports drinks or coffee.
Credit: Jon Oleson
As far as the filter bottles go, we were a bit surprised by the results. The big hunk of plastic, the Grayl GeoPress, actually produced a fairly clean-tasting mouthful of water. The durable, food-grade plastic in this bottle really stood up to heat. The Brita Stainless Steel Filter Bottle, which is our top choice for filter bottle, scored the lowest on this test. The straw seems to be made of a cheaper type of plastic, and the filter does not do enough to remove that particular chemical taste (although we did find this bottle to be effective at removing chlorine from municipal sources). If you're going to purchase the Brita, we recommend doing your best not to leave it in the hot car if you want your water to taste good.
The plastic bottles scored the lowest on this test, most of them imparting some degree of chemical taste. An outlier was the classic Nalgene Wide Mouth, which imparts surprisingly little taste to a bottle of hot water and is also surprisingly resistant to flavors. This may be due to the recycled Tritan Renew copolyester from which it's made. We found that the bottles made from silicone, polypropylene, and polyurethane imparted the most chemical flavor. If you absolutely need a collapsible bottle, all we can say is don't leave it in the sun.
We tested a variety of carry straps and handles on this year's contenders for best water bottle.
Credit: Jon Oleson
Ergonomics
In this test, we evaluated the qualities of each bottle to determine the contenders who were the most efficient and easy to use. Elements that contributed to higher scores were carrying loops/straps/handles, flip or straw caps, and designs that allowed for easier grip or carry. The top-scoring bottles in this category combine all these elements into a bottle that makes it all around easy to stay hydrated.
The champions of this test were bottles that were easy to carry, allowing for quick hydration, and even fit in our cup holders. The Iron Flask Insulated stood out, with an easy-to-grip carry handle with a carabiner clip and a flip-up straw. Our Editors' Choice, the Hydro Flask Wide Mouth with Straw, is also a sleek flip straw bottle with a comfortable carry loop that makes it easy to tote around.
The carabiner-style clip on the Iron Flask's lid aids in carrying.
Credit: Jon Oleson
The Speedfil Speedflask earned a high score here due to its slender waist and push button flip cap with a finger carry handle that clips down to stay out of the way when not in use. It's super easy to grip it, flip it, and chug as much as you need. The Brita Stainless Steel Filter Bottle also has a push button flip cap with a satisfyingly squishy silicone bite straw, a soft and comfortable two-finger carry loop, and will fit in your cup holder. Our top glass bottle, the Purifyou Premium, has a relatively slim design (although it doesn't fit in most cup holders) and a silicone sleeve that makes it easy to grab. The large-threaded cap whirls smoothly on and off and has a super comfortable finger carry loop.
The Brita Insulated Filtering Bottle has a uniquely shaped bite straw.
Credit: Jon Oleson
The low scorers in this category had elements that made them more difficult to carry, grip, or use. The Grayl GeoPress, although superior at filtering, is big and clunky and requires a lot of body weight to press the filter. The Nalgene Wide Mouth is likewise more difficult to grip, and although the lid has a plastic loop that attaches it to the bottle, it's hard, edgy, and sharp and not comfortable to carry over time. The LARQ PureVis is a slick powder-coated bottle with a small twist-off lid and no clips or carrying features. The Yeti Rambler has a nice carry handle on the lid but is big and bulky. If you're looking for something super simple to lug around town, then you'll want to avoid these bottles.
The Grayl GeoPress does a great job at filtering and purifying non potable water sources, but it takes a lot of body weight to press. Seen here filtering river water in the Sierras.
Credit: Jon Oleson
Material Quality
For this metric, we delve into the quality of the material of each water bottle. How well are the bottles constructed? Will they hold up to use and abuse? How likely are they to break? While we didn't intentionally try to break the bottles on this test, we did put them to good use. We noted the points of wear and the places where they were likely to wear out. Objectively, scores were determined by the construction and quality of the materials.
The Iron Flask uses a thick gasket to keep the straw in place.
Credit: Jon Oleson
In terms of caps, there are several factors that determine quality. Is it made of hard plastic or soft plastic? Are there rubber gaskets to seal the contents? Do the moving parts have weak joints or points? The highest scoring bottles, like the Iron Flask Insulated, Hydro Flask Wide Mouth with Straw, and the Klean Kanteen TKWide, all had hard plastic lids with rubber gaskets that produced a tight seal. Some bottles went a step further, like the Purifyou Premium glass bottle, with its rubber gasket and metal plug to ensure that your water doesn't touch plastic.
The lid on the Purifyou Premium glass bottle has a stainless steel insert so your liquids will never touch plastic.
Credit: Jon Oleson
Vessel quality was determined by the type and thickness of the material. Glass is preferred for purity of contents, but metal is preferred for durability. Plastic received a lower score overall due to its tendency to leach chemicals. Double-walled metal containers all scored well. Bottles like the Klean Kanteen, Hydro Flask Wide Mouth, and Owala Freesip were made of thick stainless steel and will take some abuse before they show any wear. Other stainless steel bottles, like the Iron Flask Insulated, received a slightly lower score due to thinner material construction resulting in slightly less durability.
We tested a variety of glass and metal bottles, measuring a variety of metrics to determine the winners in each category.
Credit: Jon Oleson
Lastly, we considered any feature that added to longevity or durability and, conversely, docked points for any feature that would wear more quickly. For example, the Klean Kanteen TKWide got points for being the only straw-type bottle with a stainless steel straw. The Speedfil Speedflask lost some points because the flip cap's mechanism is a rubber band, which is definitely a weak point on an otherwise well-constructed and durable bottle. Likewise, we noticed a crease on the plastic cap of the Camelbak Chute Mag which is a weak point and likely to wear over time.
The Camelbak Chute Mag's lid retainer has a plastic crease that we assessed to be a weak point over time and use.
Credit: Jon Oleson
How To Choose the Best Water Bottle for You
Here are four essential factors to consider when buying your next water bottle.
Do You Need Insulation?
Water bottles that provide insulation can help keep liquids cool or warm for longer periods. If you are away from refill stations or outdoors in the heat for extended periods, an insulated bottle can be highly beneficial. Additionally, since insulated bottles typically use double-walled construction, they are less likely to condense and create moisture build-up on the outside. However, insulated bottles tend to be heavier and bulkier, which means they're not ideal for trips where you're trying to decrease weight, and they may be harder to carry around in a backpack or purse.
An insulated bottle can keep liquids cool even on a hot day in the sun.
Credit: Jon Oleson
What Size Do You Need?
Choosing an appropriate bottle size can feel more challenging than it should be. After all, hydration is essential to our daily routine, but a too big bottle can sometimes be inconvenient and take up a lot of space. Too small, and you may end up thirsty. When choosing a size, identifying what type of activities you partake in and your hydration goals should be the first thought. Many people have more than one water bottle for use on different occasions.
What Cap Style is Best?
Different closures offer different drinking characteristics and various levels of leak protection. Screw-on caps are often less likely to leak and provide peace of mind in your bag or stowed away. One downside is that it can be more annoying to access your drink while doing activities such as exercising or driving. A flip-top style cap will provide easier access in those situations but is more prone to leakage if not positioned upright. Choosing your closure style based on your intended use during activities and identifying how often your bottle will be stored in different orientations.
A flip-up straw makes accessing water easy and quick.
Credit: Jon Oleson
How to Choose a Material
Water bottles come in metal, plastic, glass, and even silicone. Stainless steel is the most durable, but it is heavier than plastic. Plastic is great for packability and weight savings during hikes or adventures but can affect water taste and potential punctures, and even BPA-free plastics can still leach potentially harmful chemicals into your water. A glass bottle will preserve taste better and make cleaning a breeze, but it is also prone to breaking and has obvious weight disadvantages. Prioritizing preferences such as taste, plastic avoidance, durability, and cleaning are great starting points for narrowing down your next bottle's material choices.
A glass bottle is a great option for keeping water tasting pure and clean.
Credit: Jon Oleson
Conclusion
We've run the gamut with our water bottle testing over the years. In such a simple category, we've found a surprisingly large performance gap. Unfortunately, there is not one bottle that serves all the purposes. However, we can help steer you toward the ideal model for your specific needs. Models for long hikes, bike rides, or climbing trips will differ from the bottles used at work or taken to the gym. We hope this review helps you find the one(s) that best suits your hydration needs wherever you go.
Many of the former contenders have come back for a new round of testing. This year we tested the Hydro Flask with a pop up straw instead of a screw cap.
