This In-Line Portable Water Filter carries easily in any Geigerrig hydration pack to provide you with up to 50 gallons of purified water on the go. The spray action from the Pressurized Hydration Pack pushes the water through the filter. Activated Coconut Shell Carbon reduce waterborne chemicals, improves taste and eliminates offensive odors. Mirigard Antimicrobial Technology suppresses the growth of bacteria, algae, fungus, mold and mildew within the filter media. Removes >99.9% Cryptospordium and Giardia. For use with a GEIGERRIG Filter Ready Drinking Tube and hydration pack. Dimensions: 5.5"L x 1" dia. Weight: 0.06 kg.