G'Day there Jeff,is that a "Bags Connection"tank bag?I have one on my 1050 Tiger but it according to their website, it looks like you need a couple of spacers to fit the GTR 1400 so you wouldn't be able to swap them between the two bikes easily.I've just ordered another one (Twisted Throttle) , were there any hassles fitting it?Cheers.
Love this bag to death!http://www.motorcyclegear.com/parts/luggage/tail_bags/moto_centric/mototrek_sport_tail_bag.html
Walmart suitcase with a bicycle seat.....
Corbin Dryver series small tank bag water proof (untested by me) and attaches with locking collar so less scratching.