Katadyn BeFree will keep you completely safe, drinking from any stream or lake while hiking or backpacking. I bought the filter separately, then paired it with "Hydrapak Flux - Collapsible Backpacking Water Bottle (1 Liter)". Have used it 3 times while hiking. It works, is easy to use, has excellent flow rate, weights next to nothing and clips onto the back of my day pack. My goal was to reduce weight; with this, I don't have to carry as much water on longer hikes; I refill my 1 liter Nalgene bottle with this filter.