There's not a hard bottle out there that's cleaner, greener, and more flexible than a Platypus SoftBottle. . Each one comes with the Platypus Clean Taste Guarantee. Made with zero BPA. The SoftBottle is green, too, because its ultra reusable and lightweight, it uses less energy and materials. Plus, it weighs 80% less than hard hydration bottles. Finally, your SoftBottle defines flexible. It fits in a drink holder, a round pocket, a flat pocket, or any hand. When empty, it rolls up and fits anywhere you want it to fit. Includes pushpull cap.