The Mesa features three easy-access exterior pockets with covered zippers and a detachable shoulder strap. It secures to the top of your rack with 4-point mounting system and half-inch stiff foam insulation stabilizes your load. Reflective trim increases visibility. Dimensions - Main Compartment: 12" L x 6"W x 7"H. Side Pockets: 10.5" L x 2" W x 5" H.