Ideal for longer expeditions like ultra-trails, the Salomon Soft Flask XA Filter filters bacteria and protozoa from natural water sources, so you can drink easily and safely without needing to carrying huge volumes of water. The filter removes bacteria and protozoa from approximately 1000 litres of water to help keep you hydrated and healthy, however remote your destination. Filtering your water on the go means you can carry less water, and therefore less weight, while you run to help reduce fatigue. Shrinking as you drink to limit water bounce, the flask lets you know exactly how much you have left. It features a high-flow valve and wide 42mm cap for easy refills and drinking.