Sawyer Products PointOne Squeeze Water Filter System Lightweight, easily portable 0.1 absolute micron hollow fiber membrane inline water filter Highest level of filtration on market -- removes greater than 99.99999% of all bacteria and 99.9999% of all protozoa Built-in and removable push/pull cap; spray water straight into mouth or bottle from included pouch; attach to standard threaded water bottles Comes with one reusable 16-ounce, BPA-free collapsible pouch, two inline adapters for hydration pack bladders, a straw, and syringe filter cleaner Backed by manufacturer's lifetime limited warranty (Independent Testing Laboratory Hydreion, LLC.; Microbiological Report S05-03)