Topeak MTX Trunk Bag DX Expandable main compartment, two side pockets, and a multi-function top pocket Insulated main compartment stores up to eight 16 oz cans, Quality 2520 Denier Plus high density 840 Denier material and coated with Dupont Teflon fabric protector Extra thick rigid foam sides, top & bottom Two mounting choices available: Quick Clip mount for QR Beam Rack MTX and EX or conventional webbing with hook and loop straps