I have one of these
http://www.rockstar-puppy.com/unspbagdogmo.html and the Dog Bag USB Motor Bike Motorcycle Connection.
It works great on the C14 and I'm sure it can work on any motorcycle. I purchased last year by the end of season and my miniature pincher is not so mini anymore.
She is about 16" tall and a little to tall for the bag. We took two rides before the season ended. It's brand new, includes all attachments, covers and the original box. $90 shipped.
Tony