This is my solution for the tank bag challenge . Works well and I haven't honked the horn since .
What brand and model is that?
I have a magnetic tank bag and after a 6,000 mile ride through parts of the Western US I noticed some very very fine scratching on the tank. I tried very hard to keep it clean, going so far as to put plastic wrap (misnomer: "Saran Wrap") betwixt tank and bag. This helped quite a bit but was a pain to deal with at times.
For my purposes, I think I'd really like to try a setup like what you have there.