Can also recommend the Over-board bag - 10 days doing the NC500 in, part of the time, biblical downpours and, near Torridon, driving through a mini, near horizontal, waterfall shooting from one side of a mountain road to the other, everything in the bag stayed dry (the driver, however, did not stay as dry, particularly in the said waterfall which launched itself through the open driver's side sidescreen ....!)

(its a Morgan, sir - they all do that!)