It's as simple as "Fill it. Hang it. Forget about it." The MSR AutoFlow Gravity Microfilter represents the latest evolution of backcountry hydration, combining water filtration, storage and collection into a single, lightweight system. With the latest Hollow Fiber technology and the power of gravity, the AutoFlow is fast too—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. Features: No Pumping: Let's 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: Connects to most any bottle or reservoir with included Universal Bottle Adapter.