With a 2 litre hydration reservoir included this ultra lightweight vango sprint 7 daysack is perfect for keeping you hydrated while you are cycling running kayaking and enjoying other outdoor activities the spirit 7 has been made from a durable and lightweight fabric and has an airmesh back system with a ventilated mesh harness and straps to keep this pack as lightweight and comfortable as possible making it ideal for energetic activities there is a sternum strap and a detachable waist strap tha