I also managed to fit a small BTwin saddlebag vertically on the back of my Carradice support, hidden between the back of the saddle bag and the seatpost - means i can fit more munchies in. I'm also considering a triangular frame bag from Decathlon too...
I've got one of those, found it kept falling to one side and I was hitting my legs on it. Used it for one Dunwich, never since.
Oh. Now i'm not so excited by it... damn you Tom!
I also managed to fit a small BTwin saddlebag vertically on the back of my Carradice support, hidden between the back of the saddle bag and the seatpost - means i can fit more munchies in. I'm also considering a triangular frame bag from Decathlon too...