I have a Bootbag. Works well but I added extra press studs to the flap covering the zip to make sure no water got in via the zip. It sits low enough to allow rear visibility. Plus a couple of extra ratchet straps for added fixing.
Last year we bought two hard cases , med and large, as alternatives. They sit high so I fit a removable high level brake light as the Cobra's head one is obscured. Simple waterproof connectors makes it an easy swop. Leather straps, ratchet straps used so far. Kanulocks being looked at.
