I know that this subject has been done to death, but I add my solution to this little problem. NOTE: the bag will stay put without any fixings, but this helps in a tumble or as a theft deterent in a quick snatch. The clips are simply fixed, one on each side on with a black-headed self-tapper screw. They leave only a very small hole which is easily filled with black epoxy if you come to sell the bike at a later date. (My Givi bag has 4 fixing straps but I think only 2 are needed).