Eclan -
There's no reason why, given enough time, a bag can't be carried by someone with enough coordination to do so.
Taking what's in your lap is one thing - getting a wheel-type bag out of an overhead locker when you are close to the front of a queue to get off a smouldering wreck when several of the other exits are U/S is imbecillic.
(look at the woman in blue and all the people behind her!)
