The Personal Water Filter from LifeStraw is lightweight and compact, making it a great companion for your next outdoor adventure or emergency preparedness kit. Removes 99.9% of waterborne bacteria and waterborne protozoan parasites. How to use: The patented LifeStraw is a small tube with specialized filters inside. Place one end in unfiltered water (a glass, water bottle, river, or puddle!), and suck the resulting clean water up through the top. Anyone who can use a drinking straw can easily use a LifeStraw.