Thanks to the large bag, you can filter water for the whole crew at camp. The filter can be detached from the bag, to be used in a straw-like fashion, or with a bottle. The re-engineered membrane is better than ever against sand and silt. A gravity filter doesn't require pumping: just hang the bag and let out water as needed. - 0.2 micron pore size for filtering: - 99.999999% of bacteria - 99.999 of parasites - 99.999% of microplastics, silt and cloudiness - Filter service life up to 2000 liters, if the treated water is relatively clean - Fulfills the U.S. EPA & NSF P231 standards for quality of drinking water - BPA-free - What's in the box: Peak series 3 liter bag, filter, 1.2 meter hose with quick connector, carabiner, leak-free top for storing water, hanging strap, backwash accessory and user manual *Note!* A water filter or purifier tablets cannot remove the toxins created by algae bloom, and therefore do not make water containing said toxins safe to drink.