Burtrail 3L Gravity Fed Water Bag, Collapsible Portable Hydration Reservoir Compatible with 42mm Water Filter Cartridge for Camping, Hiking, Backpacking

["Universal Compatibility: Features a standard 42mm threaded opening, compatible with Befree and other common 42mm replacement filter cartridges. Easily convert this reservoir into a complete gravity-fed water filtration system","Accurate Leakproof: Constructed with a double-welded sealing edge and side quilting to withstand high pressure and squeezing. The innovative twist-to-drink cap features an integrated valve—simply twist to open for a smooth sip, and twist again to close for an instant, spill-proof seal. Toss it in your pack with total confidence","Premium Food-Grade TPU: Crafted from ultra-durable, food-grade TPU material that is 100% BPA-free. This safe and resilient construction ensures long-lasting performance and reliable leak prevention even under extreme conditions","Ultra-Light & Collapsible: Weighing only 118g (4.2 oz), this 3L reservoir collapses down to a fraction of its size when empty. It's incredibly light and compact, making it the perfect minimalist companion for hiking, camping, and backpacking","Rapid-Fill & Easy Hang: The wide-mouth design allows for quick and effortless filling and cleaning. The sliding buckle and hooked rope suspension system let you hang it from a tree, vehicle, or any high point, turning your drinking water setup into a convenient, hands-free gravity system"]