The Puribag Micro Membrane Filter Straw is a powerful, versatile, and compact option for emergency water purification. Eliminating over 99.99% of bacteria this survival water filter goes above and beyond other bacteria removing water filters ensuring your water is free from harmful organic, and inorganic contaminants. The mini gravity water filter system fits in the palm of your hand, and requires no power. As dirty water passes through, the hollow fiber membrane traps contaminants while allowing clean and safe water to flow through. Effective filtration, alongside it's ultra-light design means you can take this drinking water filter backpacking, camping, or hiking and not worry about sacrificing weight or space. This Puribag Micro was built as a true outdoor water filter, one that could stand up to adventures or emergencies and provide genuine peace of mind. For all your portable clean water needs, ditch bulky and complicated systems for emergency water filtration, and opt for the small and sleek Puribag Micro.