I use a Kreiga US30 with two US10's mounted piggyback on the 30. It lays on the passenger section and extends slightly onto the rear rack. There are a lot of options for holding it in place with the supplied straps. There are the passenger hand rails, slots in the rack and if needed the passenger foot peg mounts. I carry stuff that will stay with the bike in my saddlebags and clothes and other stuff that goes into the hotel is carried in the Kreiga bags. Easy on, and securely held in place.