There are 4 d-rings on the bag, on the front and back of each end. On most bikes, a bungee cord (these come with the bag) is attached to the front d-ring and goes down and around the back turn signal bar and then upward to attach to the back d-ring, on both sides of the bag. Some exceptions do exist. On a few bikes, the back turn signal sits way back on the fender. On these bikes the bungee should simply be crossed behind the sissy bar. A bag attachment instruction sheet is included with each bag.