From what I have, I'd pick my manhattan. Big enough to hold plenty and matches tons. Second would be my samur but I would get frustrated as hell cuz I never remember which side I put things on. There's no way I could carry one bag for a whole year though. I have a hard enough time carrying one for a whole month!
One I could use all year round that I don't have is the fall 06 stamped bag.
One I could use all year round that I don't have is the fall 06 stamped bag.