The MSR AutoFlow Gravity Filter represents the latest evolution of backcountry hydration, combining water filtration, storage and collection into a single, lightweight and pump-free system. With the latest Hollow Fiber technology and the power of gravity, the AutoFlow microfilter is fast as well-up to 1.75 liters per minute without a single pump stoke. 4-liter reservoirs allow you to filter large quantities at once making it perfect for groups, while quick and easy tool-free cleanings maintain high flow rates on extended expeditions. No Pumping: Lets gravity do the work so you don't have to.Fast: Filters more than 1.75 liters per minute.Lightweight: Weighs only 10.5 oz. (299 g).Field-Maintainable: Can be cleaned repeatedly without disassembly for flow recovery.Adaptable: Filter directly into most any bottle or reservoir with included Universal Bottle Adapter.