Burtrail 3.0L Gravity Water Filter System, 0.1 Micron Water Filter Cartridge & 42mm Opening Bag, Water Filter Camping for Backpacking, Hiking, Emergency Preparedness

["High Efficiency Water Filtration: This new gravity water filter system employs a high-performance 0.1-micron hollow fiber ultrafiltration membrane to effectively remove impurity, ensuring safe and clean drinking water from streams, lakes, rivers, and other natural sources.","Universal Compatibility: This filter cartridge is engineered for the industry-standard 42mm openings, ensuring a perfect fit with BeFree, and other major brands. Likewise, the bag is also 42mm openings, compatible with any standard 42mm replacement cartridge.","Fast Flow Rate & Easy Maintenance: High-capacity 3.0L (96oz) 42mm openings water bag with quick-flow filter delivering clean water in seconds. Simply shake & swish with clean water to maintain optimal performance, ensuring hassle-free use on the go.","Twist-to-Drink Cap: Drink directly from the twist-top cap for instant hydration. Then, simply twist it closed to activate the leakproof seal, which prevents spills and makes effortless hydration possible anywhere.","Easy to Use: Just hang on a tree or put the gravity water bag in a high place, hands-free filtration, enjoy effort-free (no pumping, no squeezing) filtered water within minutes.The operation of this gravity-fed water filtration system is remarkably straightforward."]