this is off my strom but it works for the triumph as well, this was just before hardware paint. not a bonnie but the system works really well. i was to poor for pelicans, and had to use seahorse boxes, the bonus is they have locks, 9just enough th keep the honest honest though.
nice part is there is nothing to loose and they come off and on in about 10sec.
NOT taking over the thread just wanted to show an option in homemade luggage.
THERE is a bonnie in the first pic, it is under the plaid sheet in the garage. ha ha

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"Peter, It seems like you have been missing a lot of work recently, well Bob I wouldn't say that I've been missing it"
ENOUGH, go out and ride!