Bought in NYC no less back in 2003. Model is 1610, size large.
Pretty big, with a full yellow vinyl lining, so waterproof. Doesn't have all the fancy bits of PAC bags...no strap for the other shoulder.
I've never been a bike messenger, it's still in very good shape even after a few years' use. I stopped using it because I started using a backpack to save my shoulder and neck muscles.