The Katadyn Gravity BeFree Water Filtration Systems revolutionizes the way adventurers access clean water. This state-of-the-art system uses a 0.1-micron water filter, eradicating 99.9999% of bacteria and 99.9% of protozoa like Giardia & Cryptosporidium, exceeding even EPA standards. Its design includes a collapsible Hydrapak Soft Flask that's both space-efficient and durable. The system's unique EZ-Clean Membrane can be maintained effortlessly. By shaking or swishing, users can rid the filter of debris without the need for backflushing or specialized tools. This system can filter up to 1,000 liters of contaminated water, eschewing the need for chemicals or other devices. The flask's rapid flow rate ensures users hydrate swiftly. Crafted from robust BPA-free Thermoplastic Polyurethane, it promises durability even in demanding conditions. Features Advanced 0.1-micron water filter ensures superior purification, removing almost all bacteria and protozoa. Space-efficient Hydrapak Soft Flask collapses easily, optimizing pack space. EZ-Clean Membrane simplifies maintenance, eliminating the need for backflushing or tools. Rapid flow rate ensures quick hydration, minimizing wait times at water sources.