Drink from (almost) any source the convertube turns almost any bottle into a hydration system, giving you the ability to drink on the move without taking the bottle out of the pack. With the added inline sawyer filter, you can refill your drinking supplies from (almost) any source and be sure to drink clean, healthy water. Enjoy pure water anywhere you go, without depending on tap or bottled water to refill your hydration system. The sawyer mini filter eliminates 99,99999% of bacteria and protozoa, surpassing epa recommendations. No chemicals needed - simply backwash the filter in intervals to ensure maximum water flow. The convertube is also a great fit to our liquitainer flexible bottles. How it works as you drink, the water passes through the side walls of the filter's micro-fibrous tubes, harmful bacteria and protozoa are trapped in the outer walls so you can be confident your water is safe to drink. Long lasting filter up to 100,000 gallons from freshwater lakes, rivers or streams. Sawyer filters are so robust, they can be backwashed and reused over and over. No replacement cartridges needed. Highest efficacy removes 99,99999% of bacteria (salmonella, cholera and e.coli) and 99,9999% of protozoa (cryptosporidium and giardia), exceeding epa recommendations for removal rates. No chemicals or batteries required. Turn your water bottle into a hydration system the convertube kit contains four adaptors, a tube with the helix bite valve and a dirt shield.