Not only does this system make it easy to filter water, it is also compact and light. The GravityWorks 2.0L system holds up to four liters of water making it ideal for up to 4 people in the backcountry. Easy, Pump free filtering. Fast! 1.5 liters per minute. Weighs as little as 7.2 oz. 203 g. Ultra Compact. Back flushes in four seconds, maintaining optimal performance with no additional parts. Proprietary PlatyTM zip opening makes collecting water easy.. Meets all EPA NSF guidelines for the removal of Bacteria and Protozoa. Made in U.S.A.