I've got a suzuki GS500f and use it mainly to ride to work. I take a bag with me for my stuff and stick it behind me on the seat and use two bungee cords to secure the bag to the bike. I've noticed that the bungee cords have scratched the plastics on both sides of the bike. I've even taped bandages around the bungee metal fasteners but it looks like it's still causing damage to the plastic. Any solutions out there? Is there a better product out there for securing stuff to you bike?