Getting something that looks right on the Roadster and, preferably, isnt 2K (Corbin) is the real challenge.
I use my bike as a commuter quite a lot and the backpack works, but sucks - I hate riding with it on my back.
Was about sold on the Hepco Becker 35L Buffalo bags. However, I thought they were leather covered hard sided bags and they are not. They are leather and my experience with even heavy leather bags is that over time they sag (even well made German leather bags).
So, I am still considering options. The Leatherlyke bags I had for a very short time a long time ago and I did not like them. Yea, they work, but .....
Anyhow, the search continues.