Topeak's RX TrunkBag DXP boasts a pop-up main compartment and expandable side panniers so it's capable of carrying plenty of gear. It's built to last with rigid molded panels mated to 600-denier polyester. 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 RX System makes it a snap to attach it to your Topeak RX QuickTrack rack (sold separately).