EPA registered purifier removes all types of microorganisms, including viruses. Lightweight, simple design fits into standard water bottle cages and cup holders. Ideal for worldwide hiking, travel, and adventure sports. Uses Virustat Technology plus microfiltration and activated carbon as a purification method. Weighs in at only 7 ounces, holds 34 ounces and can purify up to 26 gallons on one cartridge.