(TrendHunter.com) The ‘LifeStraw Mission' is a gravity-fed hollow membrane water purifier ideal for outdoor travelers, such as hikers, backpackers, and campers. The Mission has a large 12-liter capacity... (TrendHunter.com) The ‘LifeStraw Mission' is a gravity-fed hollow membrane water purifier ideal for outdoor travelers, such as hikers, backpackers, and campers. The Mission has a large 12-liter capacity...