Fox Men's Portage Hydration Pack Channeled padding on back allows for air to circulate & regulate moisture 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