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, or use the integrated plate to quickly and easily install a KLICKfix® / Racktime® Snapit or Vario Adapter.