The topeak mtx trunk bag exp is the perfect rear rack mounted bike bag for use on the daily commute errand running or touring featuring two side pockets a multi function top pocket and large main compartment the exp has a capacity of 166 litres so will carry all you need comfortably this topeak bike pannier has been constructed using extra thick rigid foam sides top and bottom and with an insulated main compartment to give durable padding for your belongings an all new weight saving const