Clearbrook Portable Water Filtration Sport Bottle A water filtration bottle for when your fresh water supply is limited - such as when camping or in an emergency. Produces 100 gallons of 750 refills of great tasting, pure drinking water. Unbreakable, lightweight, 22 oz. (1 liter) bottle fits easily in a backpack or on your desk. The "No Leak" top, with collapsible / pop-up straw can easyily be used as a squeeze bottle or used conventionally by drinking through the straw. Used and tested by International Red Cross, U.S. Olympic Team, U.S. Coast Guard, and California State approved laboratories.