Survival Hax Water Filter Straw with .1 Micron Purifier for Camping & Hiking (Green) FILTER STRAW - Removes dirt and contaminants from rivers, lakes, ponds, creeks, mud puddles, and third world tap water. .1 MICRON PURIFIER - Eliminates 99.9999% of parasites and bacteria. WORKS WITH BOTTLES - This filter can screw directly onto to any standard 28mm water bottle. PORTABLE & LIGHT - Our personal purifier straw is 7.5 inches long and weighs less than  pound. Bonus Survival Gear - Your straw comes with a carabiner, signalling mirror, tourniquet / extension tube, bear whistle, and compass. Remove the top cap for a loud emergency whistle. Unscrew the bottom to get your compass and signalling mirror. Use the extension tubing to reach hard to get water sources, or as a tourniquet. Filtration Pore size: .1 microns (particles and bacteria larger than .1 microns will be stopped) Lifetime volume: 400 gallons (1500 liters) Length: 7 1/2 inches Diameter: 1 inch Weight: 3 ounces