Ah interesting, thx for the advice. I might steal a few ideas for my own road trip setupIn the picture it has internal hard sides in the bag which make it full size. I remove them, so what ever I have in it becomes smaller and squeezes down.
One of the anti slip matts over the back end and under the bag. My bike has a pretty heavy tail tidy on giving some fix points. The bag has 4 pull down straps, but I really rely on two of those ROK straps around to make sure.