Water Collection, Storage, Filtration, And Transportation Are All Provided By STAY PREPARED- Be ready for anything with a dependable emergency water supply. With no power needed, this is a travel water filter that protects you from 99.999% of bacteria and protozoa. ADVENTURE ON: The perfect backpacking water filter. Durable but lightweight, this water pack for hiking and all outdoor recreation holds 17.5L making it a great camping companion. HANDS FREE HYDRATION- Use a water bag with a gravity water filter for reliable purification in any situation. Simply hang this gravity fed water system and enjoy fast flowing clean water! ALL IN ONE - A portable drinking water filter system that doubles as a water storage bladder. Do away with large water jugs and use this water pack for all your water collection, purification, transportation, and storage needs. POWERFUL FILTRATION: Protection against harmful microorganisms like bacteria, viruses, and protozoa means you can enjoy peace of mind, and high quality filtered water in any situation.