Katadyn Hiker Microfilter Water Filter - Very compact and lightweight - only 11 ounces. The lowest maintenance backpacking filter available. Unique, pleated cartridge design provides fast and easy pumping. Convenient and handy for 12 people (e.g. while hiking or trekking). Compatible with hydration bladders. Includes: Prefilter, bottle adapter and carry bag Capacity: 200 GallonsCapacity: 750 LettersDimensions: 3"x6.5"x2.4"Output: 1 liter per minuteWeight: 11 ozBPA Free