Here is something useful for a change – but still not safe for wallet ;) This is a pocket water filter which was designed for outdoor enthusiasts and international travelers. This is the most rugged, longest lasting microfilter available. It’s so good that it was chosen by the U.S. military and expeditions due to it’s extreme durability and dependability. Effective against bacteria and protozoa and it filters all microorganisms larger than 0.2 microns to produce clear, drinkable water. Katadyn Pocket Water Microfilter is only for people who want the best.