The Sawyer Products Mini Water Filter is one of the lightest and most versatile personal filtration systems on the market. It weighs 2 ounces and fits in the palm of your hand. While incredibly small and convenient, this filter was tested to 10 million parts of bacteria and one million parts of protozoa without a single breakthrough - the highest testing level for filtration. The size, convenience, and performance of the Sawyer Mini filter make it perfect for everything from camping with the kids to travelling abroad where tap and bottle water cannot be trusted. It comes with all the accessories you need to use this system in any of the following ways: Attach to the included 16-ounce reusable squeeze pouch to drink directly from the filter or squeeze water into a water bottle, Screw onto most disposable water bottles, Attach inline on a hydration pack (no adapters required), Sip from the personal drinking straw and drink directly from the source, or scoop up a bottle of water directly from any freshwater lake, river, or stream.