"If you ride it, they will come!" At least the scratches will.
I found that a magnetic tank bag will not only hold securely, but also attract anything known to man made from ferrous metal - much harder than the paint on the V-Strom - to it.
One day during detailing the bike, I noticed a little scratch on the tank under where the tank bag sits. When I looked at the bottom of the tank bag, I saw a paperclip that was "missing in action" from my office! I hate those stowaways.
Hey, with the tank bag in place, only I know it's there!