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The BeFree™ 0.6L Filter is the easiest and most effective way to get water free of bacteria, cysts and sediment, no matter what part of the wilderness you're in. It's easy: simply fill up the flask and let the EZ-Clean Membrane™ do the work for you. Drink it straight from the flask or pour the filtered water into your favorite water bottle. When you're done, simply collapse it, store it in your pack and enjoy your adventure!