Ultra-light reusable bottle. The Flux is shaped like a hard bottle, compresses like a soft flask, and cuts carry weight by 50%. Topped with a dust cover and twist-drink nozzle for grab-and-go hydration. There is a bail handle to keep hydration secure in your hand or your pack. The Flux stands upright like a hard bottle but when you finish your drink, this bottle packs down to pocket size. Flexible bottles have been upgraded with style.