Flexible bottles get an upgrade. The Flux(TM) is shaped like a compact sized hard bottle, compresses like a soft flask, and cuts the un-filled bottle weight by 50 percent. Topped with a dust cover and twist-drink nozzle for grab-and-go hydration and a bail handle to keep hydration secure in your hand or on your pack. The Flux stands upright like a hard bottle but when you finish your drink, this bottle packs down to pocket size. | Hydrapak Flux Soft Shell Water Bottle | Size 1 Litter