The topeak rx dxp trunk bag is a compact rear rack mounting pannier bag with a large expanding main compartment and side panniers which is ideal for commuting errands and touring elastic bungees on the top of the bag are great for holding onto your cycling jacket while your ride while the rear bike light clip and reflective strips help you to stay safe on the road topeak trunk bags all use a quicktrack mounting system so you can mount and remove the pannier bag quickly and easily and the c