update...
i have the same oxford bag jonnie5 speaks of, only use it on the tank.
i went to bunnings and bought some non slip rubber stuff (the stuff you buy for your passenger seat on ebay)
i whack it on the tank and it then doesnt scratch it.
but since i now have a 10 i picked up a bagster cover and bag in shit hot green
its works well, its huuuge probably too big. and doesnt move at all.
i still use my tail hump bag, its good for the wets and gloves.