Topeak MTX TRUNKBAG DX 12.3L Pannier Bag BlackTopeak's MTX TrunkBag DX boasts an expandable main compartment to carry all the gear you need. It's built to last with rigid molded panels mated to 600 denier nylon. And, it's packed with handy features, such as a shoulder strap, carrying handle, taillight clip and top elastic straps. There are even reflective strips for safety. Plus, Topeak's ingenious MTX System makes it a snap to attach it to your Topeak MTX QuickTrack rack (sold separately).