Excellent for scouting, the Sawyer Inline Water filter provides you with safe drinking water. Simply use the filter by dipping it inline in any hydration pack or in the bottle, or with a gravity-feed shower bag for large quantities of water. This water filter bottle purifies 1892.7ls of water free of bacteria, cysts and protozoa. The filter is -0.1 micron absolute, which offers the highest removal of bacteria, cysts and protozoa. This Submicron Hollow Fibre Membrane filter uses a cluster of fibrous tubes to filter out 99.99999% of contaminants. Comparatively, this water purifier works more efficiently than pumps and chemicals and keeps you protected from many water prone diseases.