Topeak Velcro Strap Version Dxp Trunk Bag with Rigid Molded Panels Capacity: 22.6 L / 1380 ci Molded panels are protective and water repellent The divided main compartment features a two-stage expanding top plus side panels that zip open into full panniers for even more capacity. Compatible with all rear racks. Attaches to rack with velcro straps Straps provide security and attach to any brand rack