The Katadyn Pocket Microfiter is small and light, so you can easily take it anywhere. It's the most durable filter on the market and comes with 20 year warranty. It uses a 0.2 micron silver impregnated ceramic cartridge that prevents bacterial growth and can be cleaned out in the field. You'll get 13000 gallons out of one. A hydration system connector, pre-filter, bottle clip and carry case are included. Used by relief organizations and professionals, this it the best, most travel friendly water filtration system you could bring on extended adventures to third world countries and off the beaten track places.