Topeak MTX Trunk Bag EXP Bicycle Trunk Bag with Rigid Molded Panels Used by both professional and amateur riders alike Made using high quality materials and components Tested to ensure quality and durability Expandable bike bag with divided main compartment and expandable top 2 side panels with expandable panniers add even more storage space 600-denier nylon construction with rigid molded side panels Shoulder strap for easy carrying; RedLite clip and elastic top bungees 1,010 cubic inches of storage; measures 9.8 x 14.1 x 8.5 inches (W x H x D) and weighs 2.36 pounds