I saw the other bike in your garage, and I confirm that ladies deserve something better than our little rear cushion ;-)
I was mistaking : this is not 2 panniers of 36 L each but 2 x 18 L = 36 L.
This is somehow the same limit I guessed from other sites. For example Hepco & Becker. In order to keep our little rebel cute, I think maximum dimensions would be : 40 cm x 28 cm x 18 cm (sorry guys, I'm metric minded).
Oxide announce a combination lock, but I can't see it on their pictures.
I see something on yours. Is it an option ? Is there a combination system, where ?
Can you tell us more, please, dear good fellow ?