Katadyn Gravity Befree 3.0L Water Filter, Fast Flow, 0.1 Micron Ez, 8020470 With the Katadyn Gravity BeFree 3L Water Filtration System, you no longer have to worry about where your next drink will come from. Just fill up the flask and let the gravity do the work through the EZ-Clean Membrane. Maintain the EZ-Clean Membrane quickly and easily for longer life and more enjoyment. Simply fill the flask with water, attach the cover and shake free the debris. Or, remove the filter from the flask and swish in any lake, river or stream. And when you?re ready to hit the road, the collapsible flask packs small to fit into tight spaces. Just smash, stash and go!.Hydrapak Soft Flask is longer lasting, rugged, high-tech, flexible, BPA-freeNo backflushing and no clumsy tools. Simple shake or swish the EZ-Clean Membrane in the water and be on your way0.1 micron hollow fiber technologyFor solo or group useSuitable for cloudy waterLightweight and portableFlow Rate: 2 liter per minuteTested to 1000 L, depending on water qualityWt. 6.8 oz (192g)Size: 17.6 x 9.0 in. 0.1 micron water filter removes harmful organisms, surpassing EPA standards Collapsible 3.0L hydrapak soft bottle flask packs down small Ez-clean Membrane is simple and easy to clean by simply shaking or swishing the filter to clean debris, no backflushing or extra tools required Filters up to 1, 000 liters of contaminated water without using chemicals or other devices and hydrate quickly and easily with the free flow channels fast flow rate Made from durable BPA-free Thermoplastic Polyurethane