No. Mine fits securely to the sissy bar. I can mount it so it sits on the rear seat or mount it so it over hangs the fender. It fits pretty tight over the rear pad to begin with, but it also has straps to help secure it. Mine went about 1500 miles in 4 days and did well. No problems or complaints what so ever. It even came with a rain cover... that I had to use.Thanks guys. You don't need a luggage rack with the Tour Master do you?