Many people carry things they need on a motorcycle - a travel bag or something like that. Which need to be held tight. In that case many bikers are using elastic ropes. There are two strong hooks on both ends of the rope, so there is no embarrassment to tie like a rope. These elastic ropes will hold any luggage tightly to the seat. At the same time these are long lasting and strong. These can always be left on the bike with the grub rail. It doesn't look like anything strange.