On any long distance hike where you can’t carry enough water it’s important you have some way of purifying your water. Boiling water is the most reliable way but also the most inefficient and time consuming way. If you don’t like the taste of tablets and chemicals, a water filtration system is the next best choice. We chose the Katadyn Vario and tested it on our 28 mile, 3 day hike on the AT, Appalachian Trail. Very fast and efficient.