After all that i decided to try one of those slip on tail pack things from OTR, should be ok for carting locks around and a few other bits. I'll give some feedback on it after some useage.

well the tail pack from otr is pretty good, although i'd have to say for 50 squids they could have put quick release clips on the straps that attatch to the grab handles, as its a bit fiddly threading and unthreading the buckle all the time. It is small, and only useful for a lock and a collapsable rucksack plus a few other small things.

Naturally it turned up the day after my tank bag magnets picked up a huge rusty nail from work and trashed the paint on my tank :( to add insult Yamaha don't do touch up pots. Need some stickers now.