Ultra light and compact water filter attaches directly to water bottle or bladder. Tube connection adapter attaches directly to hydration system drinking tube. Filters up to 50 gallons. Removes Guardia and Cryptosporidium. Bite valve for drip free easy drinking. Integrated cap keeps the mouthpiece clean. Miraguard suppresses growth of bacteria, algae, fungus, mold and mildew within the filter. Includes 4 replacement pre filters. US Made.