Speaking of the Shad 23 liter luggage system, I recalled that I had a set of those in my accessory closet. I bought them for my R12RS, which has a set of Shad luggage rails on the bike, which I use to carry their large bags when on camping trips. Unfortunately, their lids open inward, toward the passenger's seat and the seat prevented the lids from opening enough to allow access. So I have bolted them to the SW Moto quick detach luggage mounts that I use on my F650GS. On that bike they are located far enough away from the bike's seat so that they can be fully opened.
Attached are photos of the luggage, bolted to the SW Moto grid. If you buy these cases, I recommend that you also purchase an inner liner so that you can remove your stuff in one yank, instead of fishing around for loose items. I am currently using the plastic bags that the cases were packed in as liners. I might add that the Shad 23 luggage cases were quite cheap. Not much more than a good set of soft luggage. But they are definitely built to a price and their quality is not up to Givi standards in my opinion, although Shad's larger cases are superior to similar Givi cases.