LifeStraw is ideal for hiking, backpacking, camping, travel, and emergency preparedness. The straw-style filter design lets you turn up to 1,000 liters of contaminated water into safe drinking water. Lets you drink directly from streams and lakes or from any container. Uses advanced hollow fiber membrane technology to filter up to 264 gallons or 1,000 liters of water to 0.2 microns. Removes 99.9999% of waterborne bacteria, including E. coli and salmonella and 99.9% waterborne protozoa, including Giardia and Cryptosporidium. For each LifeStraw you purchase, one school child in a developing community receives safe drinking water for an entire school year.