The LifeStraw personal water filter lets users safely drink water directly from untreated and even dirty, contaminated water sources. Ideal for hunters, hikers, fisherman and emergency preparedness, the LifeStraw is the most advanced personal water filter available today. It filters up to 264 gal (1,000 L) of water with its patented Hollow Fiber Membrane that filters to 0.2 microns. This personal water filter removes 99.9999% of waterborne bacteria and protozoan parasites. It's also ultralight at only 2 oz.