To meet the needs of multi-activity backcountry adventurers, MSR set out to engineer their most versatile water filter ever. The MSR Trail Base Water Filter Kit features modular components that allow it to be used as a gravity system at camp, a pocket-sized filter on the trail, or a fast-and-light reservoir when you need to carry clean water with you. Whether you're hiking, biking or camping, this handy kit offers incredible flexibility and options to truly adapt to your adventure and the filtration task at hand.