The Surf To Summit Tour Back Rest with Pack is an instant comfort fix for the Tarpon series of boats. Installation is easy, just strap it over the hard plastic back and you're done! The Tour Back Rest is constructed of the same soft, self-contouring thermal-molded foam used in Surf to Summit's top-of-the-line GTS seats. The contoured seat pad measures 15.5" wide x 15" long with a 10" high x 14" long back pad. An attached pack allows you to carry anything from extra equipment, to a lunch. The Surf To Summit Tour Back Rest with Pack features 320 cubic inches of storage.