Hydrapak® 3 Liter reservoir with Plug & Play® detachable drinking tube & slide top large opening for easy filling & cleaning * Large main storage compartment to pack essentials for longer rides * Secondary compartment allows enough storage to carry an additional reservoir (not included) or additional items * Cinch down straps and flap on outer section designed to securely carry a full face or open face helmet * Channeled padding on back allows for air to circulate & regulate moisture