I recently used a couple of these on my Pacific Crest Trail hike. I needed to be able to carry large amounts of water through the dessert in Southern California in the lightest weight vessel possible and this did just the trick. When not in use, the Platy Bottle folds up and fits nicely in the front mesh pocket of my pack for easy access when at a water source. The bottle are also well constructed, thin but durable, and never had one break in the thousands of miles I used them.