The Katadyn Pocket Microfilter is the most rugged, highest capacity microfilter available, and has a lifetime warranty. At 20 oz., it isn't the lightest filter in the world but it's still quite compact at 10" tall, and its rugged aluminum shell means it'll go the long haul. That is why it is used by U.S. and other militaries around the world, as well as standard issue for the International Red Cross field workers. It has a exclusive silver impregnated ceramic element that lasts up to 13,000 gallons. Microfiltration method is a field-cleanable 0.2 micron ceramic depth filter, with an output of up to one quart per minute. Includes hoses, prefilter, bottle clip, hydration pack connector, measuring gauge, silicone lubricant, a fabric bag and plastic zip lock bag for output hose. Measures 10" x 2".