Perfect rear rack mounted storage bag for commuting, errands, and touring. Two side pockets open out into panniers. Large capacity main compartment with two side pannier bags and a multi-function top pocket. Other features include: Insulated main compartment, elastic top bungees, 2520 Denier with Dupont Teflon coating, extra thick rigid foam sides, top and bottom, 3m reflective strip for safety, built-in carrying handle, plus detachable shoulder strap, will fit beamrack or standard pannier rack, safety light clip, 31.8x16.5x20.3cm, capacity: 1030ci, 1290g. All Topeak Trunk bags are supplied with comfortable shoulder straps for when you're off the bike.