I still have an old Ventura bag I slip over the the triple tail on my Ulysses when it's in the upright position. Tremendous quality, I've had it since 1996. Originally, I bought it for a BMW R1100GS. The frames are ugly, though. It looks good on the Buell as there isn't a frame on it.
I haven't bought an MT-09 yet, but I am planning to. I thought for touring I'd simply ratchet strap a dry bag I bought from a diving shop to a rack. The question is which rack? I don't want an ugly top case as they stick out too far at the back, although I concede they're very useful. So I won't be looking for a rack that is designed to take a top case. Are there any aftermarket racks available?