I tried searching for photos on the web but i couldn't find it.
I wore the medium (smaller size) as a messenger and it works for me because i'm short 5'3''.
I think the large one definitely has more strap.. i'm thinking off hand 3-6 inches approximately. It can be worn as a messenger, but not the type where the bag will sit on your hip.. it'll be a little shorter than that.
Sorry i couldn't be more descriptive : (