The LifeStraw is an inexpensive yet effective water filtration device that’s perfect for outdoor carry. Without the use of chemicals, batteries, or moving parts, it filters a minimum of 99.99999% of waterborne bacteria and a minimum of 99.9% of waterborne protozoan parasites from at least 1000L or 264 gallons of water. It also features a shelf life of 5 years, so you can feel safe in storing a couple in a bug-out bag or emergency kit.