The Vango Sprint 3 Hydration Pack is a compact pack that has a total capacity of 3 litres & comes with a 2 litre hydration pack making it an ideal & comfortable way to carry your much needed fluids with you when you are hiking running or cycling With its lightweight yet breathable Air Mesh back system & super-lightweight & ventilated mesh straps this pack offers an extremely comfortable wear while the sternum strap & the detachable waist strap mean that you can adjust the pack to ensure it is the most comfortable & secure fit for you After all the last thing you want while running is your bag bouncing around The Vango Sprint 3 s 2 Litre hydration pack is accessible through a Velcro opening at the top of the back system this leaves room in the front of the bag for a zipped front pocket with a key clip inside ideal for your essentials some bungee lashing on the front for stuffing a rain jacket in & a loop to attach a light to making this a fantastic companion for running cycling & hiking