The HydraHike hydration backpack is comfortable, convenient and made to last for all adventures. *NEW* Dimensions: 17.7" x 11.4" x 1.0" Weight: 0.73 lbs Backpack Volume: 4 L Reservoir Volume: 2 L 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