Water is the number one backcountry necessity, which makes the Katadyn KFT Expedition Filter worth its weight in gold. Filtering at a whopping 4 liters per minute, the Expedition Filter keeps you and your crew hydrated with pure aqua after a tough day of miles on trail. With its cartridge lifespan of 100,000 liters, we're more likely to need an oil change (or a new car) before we go thirsty.