Here's my Roadster luggage - Oxford throwover fabric bags, 24L each, and expandable, reinforced with 6mm ply backs, fitted to Easybrackets. They come off in seconds. Roll bag is an Ortlieb Rack Pack 24Litre, totally waterproof, bungeed on to the standard rack. Home-made grab rail.
The side bags need stuff inside wrapped in plastic bags , but that's normal.
I think the Roadster suits bags like these, not hard cases. Still room for a passenger or a tent and beer on the pillion seat
Next is a 3 into one exhaust...