Thought you guys might lke to see this . . .
I needed some cargo space that would accommodate my lap top & case (just a bit too big to fit into either of my hard bags) as well as a few other work items. So, I did some surfing and purchased an after market case and then fabicated a bracket to mount it over my rear fender.
Check out the attached photos. - Norm.
NOTE: I ride solo as my wife has her own ride.