I don't like tank bags. Regardless of how careful you are they scuff the paint. So I rely on tail bags on the rear saddle to carry a few extra things when needed.
In searching for a tail bag for my Z1000 they were all either expensive as hell (Oxford, expensive but slick) or looked like toasters. So I started looking at tank bags that I could modify. So I got a Joe Rocket Blaster bag. It's a nice low profile for smaller loads and has an expansion zip to double the height from 3 to 6 inches when needed.
To modify it for tail bag duties I removed the magnets and used the extra tie down loops that it has. A couple of snap buckle small web utility straps from MEC and I have my no paint touching tail bag.
In the pics below where you can see the bottom of the saddle I used the D rigns that were in the loops on the front but had to cut them off on the rear loops. The rings were too thick and held up the saddle from clicking home. So I just looped the utility strap though the webbing loops and around the bumps under the saddle.
It's simple, takes about 30 seconds to mount or unmount the bag on the saddle and has a small level of security in that the hold down strap buckles are locked away under the saddle.