The Katadyn BeFree 3.0L Gravity Water Filtration System utilizes gravity to filter your water. You can even fill a hydration bladder using an included quick-release hose kit. Simply hang the HydraPak using the integral bail handle and carry loop, and filter up to 2L per minute. Easily clean by shaking or swishing the EZ-Clean Membrane to remove debris. The .1-micron microfilter is tested and offers protection against harmful organisms. A 43mm wide-mouth opening allows for easy filling from faucets and streams.Manufacturer model #: 8020470. Integral bail handle and carry loop Filters up to 2L per minute .1-micron microfilter 43mm wide mouth Includes quick-release hose kit