Lately there has been discussion on what to pack whilst on a riding tour. Here is what GAW/Gordon of Scoot'n Art (<--- link) carries with him. It appears to be a long list of must have items. I'm still trying to figure out how to pack all that stuff. I just have to leave room for the "kitchen" sink on top and fasten with bungie cords .
I have Kappa side cases secured by Givi racks. Sides cases are 40 Litres x 2, and the topcase is 44 Litres. There is also some storage under the seat. I also made a Tool Tube to carry my tripod