While you are walking or exercising, you stay fitter by drinking well. This is very easy with the Deuter Streamer 3.0 L Transparent water bag in your backpack. The material of the water bag is made of a smooth and strong polyethylene that does not give a plastic taste to the water. The hose and mouthpiece are also coated with a plastic taste. The mouthpiece easily emits water without you having to bite it hard and it is also leak proof. The water bag can be used in backpacks that are suitable for a hydration system. You place the bag in the designated compartment on the inside of your backpack. The drinking tube is passed through the opening in the lid or on the top of the bag.