Topeak mtx trunk bag explarge capacity mtx trunkbag containing one main divided compartment with two expandable pannier side panels our unique construction process provides rigidity and water repellency compatible with all mtx quicktrack racks with attached side frames mtx side frame are required for use on mtx trunkbag with panniers features capacity16 6l material 600 denier polyester size36 x 24 x 21 5cm compartments1 divided main two side with expandable panniers insulationmo