Let gravity take its course, and do the filtering for you with the Katadyn BeFree Filter. Ultra-durable, collapsible reservoir lets you take advantage of smash, stash and go convenience for easy transport in a pocket or pack. At the next available watering hole, simply remove the top, dunk it into the water source, place the filter/cap back on, swish and drink. It's that easy! Drink directly from the reservoir, or use it to refill another bottle. Named among the inchBest Products of 2017 inch by Outside Magazine for its compact carry and industry-leading flow rate. Collapsible reservoir makes it perfect for hikes, travel, and everyday use Filters 2 liters per minute Unique shake-to-clean filter technology-no back-flushing required Drink directly from reservoir, or use it to refill another bottle 0.1-micron microfilter safely removes protozoa and bacteria (tested to EPA standards) 3L reservoir has integrated bail handle and carry loop for easy filling and carry Tested to 1,000 liters (results depend on quality of source water) Recommended for individual use BPA-freeNOTE: The BeFree 3L does not remove viruses. Please note that initial editions of this packaging were misprinted to reflect "Meets EPA test standards for bacteria, protozoa and viruses". While it does meet the EPA test standards for bacteria and protozoa, this is not accurate for viruses. Refer to the BeFree 3L product manual or our website, which all has accurate information regarding microorganism removal. Go with the flow! Buy now.