How the !§$%&!!! do you carry a M18 or similar motocycle D-lock?

Ok, but it's not all too simple, because I still did not hear a good solution. I was imaging something like a good idea how to fix a 18mm lock to your frame with something I did not think of.

What's wrong with the solutions suggested or use a rack, use a lock holster, use you're belt, use a small little bag. If you don't say why these options are not viable how can you expect people to help?