I am thinking about getting the Monogram Eclipse Keepall Bandouliere 55 for my birthday. Can anyone share pros and cons for this bag? I am looking for a larger travel bag that I can carry onto an airplane and I believe the 55 is the largest allowed. Wear and tear issues (aside from standard wear and tear. I understand travel can be harder on bags)? Theft or security issues? I really love this bag but I don't want to be too cautious or too nervous to use it and thus a waste of a birthday present!