The Grocery Pannier is No Longer Available as of 2015
The main downside is the upper structure is flimsy. When fully loaded, it moves around, pokes out and is a un-gainly. There are no compression straps to bring the load in closer to the bike so items can shift and hang out. In some sense, it is the tradeoff for the bag being light and compressible, however, it there was just two small compression straps on top that ran perpendicular to the bike, this issue would like to be resolved. In the meantime, you can address this issue by adding your own compression straps and bungee cords. We bought bungee cords and were happy.