Meet the LifeStraw Peak Series 3L Gravity Water Filter System. It’s the simple, economic lightweight and compactible option for back-country camping and backpacking. The optimized filtration cartridge boasts a high flow rate and ability to remove sand and silt without clogging. The water storage bag is made from premium materials for extra durability so it can stand up to the same toughness and usage you put your other gear through. Designed to be ultra-versatile and fully leak-proof, use while moving about, or as a straw filter by itself or with a standard water bottle. For every LifeStraw product purchased, a school child in need receives safe water for an entire school year.