Dual molded side panels combine with flexible 600 denier fabric to form a semi-rigid, weather resistant trunkbag. Divided main compartment and side panels expand for extra storage capacity. Rear water bottle holder lets you carry more water on extended trips. Attaches to a rack with straps.Key Features:Compartment: 1 divided main with multi-stage expandable top, two sides with expandable panniersCapacity: 19.4 LMax load: limited to rack maximum load ratingMaterial: 600 denier polyesterInsulation: rigid eva foamBag attachment: Hook & loop fastenerSize: 35 x 25 x 21.5-29 cmWeight: 940 gFeatures: Water bottle holder, Shoulder strap, Carrying handle, 3Mreflective strip, Safety light clip, Reflective elastic cord, Mesh pocket