DayOne Waterbag Water Filtration Backpack by CoolShitiBuy Keep prepared with quick and easy access to safe drinking water with the DayOne Waterbag. This survival water filtration backpack is a 2.5-gallon (10-liter) family-sized water purification unit with integrated filter and backpack straps. Th... 2 2,362 $59.39 via Amazon Facebook Pinterest Save2 Check it out