How many different sizes were made? Can you get into it without having to unsnap the band that goes around the middle? (I'm thinking it might be a pain to have to unsnap that every time I want to get into the purse, and also that it might look goofy if left unsnapped.) Is the shoulder strap long enough to wear across the body (or is the bag just too bulky to do that)? Please tell me your likes and dislikes regarding the Sac D'Epaule! Thanks!