The MSR Trail Base Personal Pump and Gravity Water Filter System features modular components to make it versatile enough to meet the needs of any multi-activity backcountry adventurer. The Trail Base microfilter kit can 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. Whether you’re hiking, biking or base camping, the Trail Base microfilter kit offers incredible flexibility and options, making it the one filter that truly adapts to your adventure and the filtration task at hand. Removes Bacteria (99.9999%), protozoa (99.9%) and particulate and filters 1-liter per minute. Includes trail filter, dirty water reservoir for gravity fed-filter system, and ultralight, durable clean water reservoir, which features our 3-in-1 cap for easy filling, drinking and pouring. Hollow fiber filter meets U.S. EPA drinking water standards and NSF protocol P231 testing standard. Available in 2 sizes: The 2-Liter system measures 15x6.5x3 inches and weighs 16.3 ounces, and the 4-Liter system measures 15 x8.5x2.5 inches and weighs 18.2 ounces. Includes trail filter, dirty-water reservoir, clean-water reservoir, easy-pour cap, and connection hose. Manufacturer’s 3-year limited warranty. Made in the USA.