Simply fill up the included water pouch at a lake or stream, screw the hollow-fiber filter onto the pouch and squeeze the pouch to push the water through the filter OR Check out the different ways to use your Mini. Includes a 16 fl. oz. pouch; collapsible pouches are made from durable Mylar foil (100% BPA FREE), can be rolled tightly for easy packing, and can be reused hundreds of times. The Mini has a removable push/pull cap built right in, so you can spray water straight into your mouth or use it to fill a water bottle; fills most water bottles in 30 seconds. The Mini removes 99.99999% of all bacteria, such as salmonella, cholera and E.coli; removes 99.9999% of all protozoa, such as giardia and cryptosporidium.