ship69

Yes that would help a bit, although it's a serious soaking off the back wheel itself that would worry me, and that would be coming from the same direction as the place where the bag connects to the bike... so tricky to get the cover to protect at that point.

This is absolutely brilliant. After MUCH searching you have built exactly what I want. It looks like there is nothing commercially available anywhere that gives you an overnight/cabin bag with wheels AND a good panier combined so I will need to buy the components and build it myself. What component parts did you buy? And what lessons have you learned / what improvements to your core design would you make? e.g. It occurs to me for one thing that the cabin bag would need to be extremely waterproof in the case of it raining J