This is a limited edition Carradice Zipped Roll, in Harris Tweed (Bramble colorway). It's in like-new condition; I mounted and used it once and it's otherwise been sitting on a shelf.
It can be mounted as a saddlebag, or as a handlebar bag if your drops are wide enough (28cm/11"). The bag is soft but the top is reinforced by a wooden dowel, so it won't droop if loaded unevenly.