Topeak Trunk Bag EX. Features: Medium capacity with insulating rigid molded EVA foam side panels 420 denier nylon fabric for rigidity and water repellency Divided main compartment, two mesh side pockets for extra capacity, and rear water bottle holder QuickTrack click 'n go compatible (for use with Topeak MTX racks, see EX Beam, Explorer, Super Tourist) Includes carrying handle, shoulder strap, 3M reflective strip, tail light clip, bungees Specifications: Pack Type: Trunk Bag (Rack Top Bag) Pack Capacity: 8L Mount: MTX QuickTrack Waterproof: Water-Resistant Material: 600D Polyester Dimensions: 14.2 x 8.3 x 7.5" Color: Black Weight: 870g Looking for a trunk bag that is compatible with other racks? Checkout the strap mounted version.