Sawyer's Point One Squeeze Water Filter is one of the lightest and most versatile filtration system on the market. With a total weight of 3 oz. and the ability to roll up, it takes up virtually no space in your pack. Simply fill up the pouch at a lake, stream or river and screw the filter directly on to the pouch. Squeeze the bag through the filter into your container of choice or drink directly from the filter which has a built in push pull cap. The filter also attaches to most threaded water bottles including 2 liter bottles. Replacement pouches (set of 3) Campmor Sku# 84705 Removes up to 7 log (99.99999%) of all bacteria like salmonella, cholera and E coli. and 6 log (99.99999%) of all protozoa such as Giardia and Cryptosporidium. All Sawyer water filters exceed EPA removal rates and these are the highest rates available. Kit includes: Point One Squeeze Water Filter / 3 lightweight durable collapsible pouches; 0.5 L, 1 L and 2L sizes / 1 replaceable pop up drinking spout / 1 cleaning syringe / cleaning and maintenance instructions Maximum weight (with largest pouch) 3 oz.