Topeak RX Trunk Bag DX One main compartment; two zippered; expanding side panniers; multi-expanding top Compact design with expandable multi-top for extra capacity Top mounted carry handle for off-bike use Molded panels are protective and water repellent 12.2 by 8.1 by 6.3 - 8.9 inches (L x W x H); capacity of 445 cubic inches