Now multi-activity backcountry adventurers can get a variety of water filtration needs met with one great system. Ultra-versatile MSR® Trail BaseTM Water Filter System gives you 3 filtration options. Use it as a gravity filter for larger groups, or quickly convert it into a smaller filter for the trail. It also converts into a fast-and-light reservoir for carrying clean water with you. Whether you’re hiking, biking or basecamping, the Trail Base Water Filter offers incredible flexibility to adapt to any adventure.