The topeak mtx trunk bag dx the topeak trunkbag mtx dx is a larger trunk mounted bag with plenty of room to fit the weekends kit in if you love your cycling trips away or itrsquos just for the daily commute and you need that extra added protection the mtx trunkbag dx features a divided main compartment two zippered side pockets and rear water bottle holder the unique construction process combines moulded panels and flexible fabric for rigidity and water repellence so you can ensur