Instant Fresh Water_x000D_ fieldhills Filter straws are the perfect aid in emergencies. It's a must-have when camping, hiking, climbing, hunting, trekking, backpacking, biking, boating, car riding, outdoor travel and wilderness adventures._x000D_ Easy to Use_x000D_ Get close to a stream or lake and use it to drink directly from the source, or fill a water bottle and insert the filter to start sipping. huge dust cover can cover the water outlet and edge of the water filter._x000D_ Food Grade Material_x000D_ Made of sturdy food-grade plastic and BPA-free ABS, it is very safe and has a filtration accuracy of 0.01 micron, which can provide you with a reliable source of pure drinking water anytime and anywhere. especially in emergencies or disasters._x000D_ Advanced Safety Technology_x000D_ Ultimate Outdoor personal water filter, made of 0.01 micron ultrafiltration membrane, It can filter out 99.99999% of tiny materials,sand, sediments.can definitely provide up to 1500 liters 396 gallons of drinking water._x000D_ [4-level filtration]_x000D_ 1. High-performance medical grade hollow fiber ultrafiltration membrane, 2. Medical grade PP cotton, 3. Coconut shell activated carbon, 4. Medical grade PP cotton. It's portable and the perfect solution for water shortages in emergencies, instantly turning nearby water sources into safe drinking water.