The Sawyer Squeeze Filter is incredibly light, portable, and versatile. Exactly what you need when far off the grid and surrounded by untested water sources. Takes up almost no space in your pack. Great for international travel, too. Includes an ultra-light, foldable Cnoc Bladder Pouch for easy hydration portability. Light and portable Rolls up, uses virtually no space in your pack For hiking, camping, hunting, fishing, disasters, travel abroad and more 750ml Cnoc bladder made from extra-tough TPU Includes cleaning coupling and plunger Hollow fiber filter membrane is rated to 0.1 micron absolute filtration Removes 99.99999% of bacteria such as salmonella, cholera, leptospirosis, and e. Coli, and removes 99. 9999% of protozoa such as giardia and cryptosporidium