IMAGE&reg; Water Filter for Soldiers Hiking Camping Fishing Hunting Climbing Trip Travel Out-door Work Survival Turns rain, lake, river water into drinkable water immediately Smallest & Portable Lightest &lt; 90 gram (3oz) Environment Friendly (Nano Tech Cleanable filter cartridge) Long Lasting (Each cartridge will be capable to filter 2,000 liter water(530gallons) )