The HydraHike hydration backpack is comfortable, convenient and made to last for all adventures. Main compartment is accessible through top zipper. Lightweight ripstop fabric. Insulated reservoir pocket + 2L wide slide reservoir included. BPA free reservoir has bite valve with on/off switch. 360° reflectivity: Be bold. Be bright.. Front accessory pocket with organizer. Adjustable waist belt. Exterior daisy chain for attaching gear. 17.7″ x 11.4″ x 1.0″(Color :Grey Blue)