I'm kind of curious to know which Carradice it is and whether or not you are using any kind of a rack with it. When I started using my Carradice Pendle for commuting without a rack on the bike it always felt a bit awkward. The bike never felt quite right, a little unbalanced I guess I'd say. Once I put a rack on the bike for the bag to rest on it was more stable and I ddn't even notice it was there. With only 7 pounds you are probably using a Barley and I doubt if a rack would be necessary but I thought I'd mention it.