Microfilter utilizes Hollow Fiber Technology and advanced engineering to make water treatment highly mobile and easy to use Ergonomic design, diminutive size and tool-free maintainability make it just as appropriate on day trips as it is on multi-day excursions Filtration rate of three liters per minute; includes Quick Connect bottle adaptor, allowing direct connection to all MSR hydration products and a variety of other "wide mouth" containers Hollow fiber filter with 0.2-micron pores, effective against protozoa, bacteria, and particulate; three liters per minute flow and 20 strokes per liter of water Includes limited lifetime manufacturer's warranty; made in Seattle, WA