Ducati makes a side bag with mounting hardware. Check with your dealer for availability as they may be out of production by now. I have one and it fits OK but space is limited. Don't laugh - my tank bag is a 30 year old Eclipse and it works pretty well. (Yeah, I'm that old) There's a bunch of stuff out there. Kriega makes a full range of soft luggage including tail packs and tank bags with some innovative fastening systems and most of it looks pretty nice. Others on this forum might have first hand experience with it.