The camelbak circuit 15l hydration vest is an incredibly light weight vest that holds enough supplies to keep you hydrated for a long session without restricting your movement or weighing you down the camelbak hydration pack holds 15 litres of water as well as coming with 2 pockets at the front for storing additional water bottles with a sweat proof pocket for your phone card and keys as well as a smaller compartment that stretches to store any snacks you39ll be able to carry all y