Builded a rack and mounted a case for my road trip.
Ok, its looks not so nice, but it works for me. Better than a backpack
I'd be careful with that rack due to height for one but don't put a lot of weight in it. You will find it will bounce and shake a bit without an additional brace to steady it.
This comes from experience.
Here's the current one I made for my super sport
Fuel tank back from the painter; now soaking inner with Olaxic Acid to clean up some heavy surface rust.
He did a beautiful job, so now need to save some more pennies to have the fairings, etc painted.