There are many different water filtration systems for the outdoorsman. Some require a special water bottle, others use ultraviolet light. But the LifeStraw, a water filtration straw, is the most advanced personal water filter available today. Everything is contained in a small tube with special filters allowing users to just stick it in the water they want to drink and the LifeStraw will purify it as they drink. No waiting around for water to purify. LifeStraw filters down to an incredible, 0.2 microns in size! This removes virtually all the bacteria (99.9999%) and protozoa (99.9%) from contaminated water, and reduces turbidity (muddiness) by filtering out suspended particles. This water filtration straw is great for campers and hikers who may be drinking from rivers and lakes and unsure of water safety. Even campers that are in a campground may be a little apprehensive of the pump water. While you are out hiking, if you consume the recommended 3-4 liters of water per day, LifeStraw will last you between 250-330 days of hiking. It provides great convenience over a purifier or pump that takes a fair amount of time to finish purifying. You don’t have to wait for the LifeStraw just fill up your water bottle in the river and use the straw to drink it.