If you enjoy venturing far off the beaten track where few people roam and water is scarce, consider packing this extremely efficient water purifying system from Lifesaver. The Liberty has a 400ml capacity and is fitted with a replaceable filter cartridge and an activated carbon disc that removes 99.999% of viruses and 99.9999% of bacteria. It also comes with a 5ft Scavenger Hose for drawing water directly from source. To use, simply fill it up from the rear or via the hose, pump the piston a few times, point the spout towards your mouth and press the lever on the side. Voila, fresh, palatable water is squirted into the mouth and you’re ready to continue on your way. A top buy that could, quite literally, save your life.