Well, if airlines actually enforced the 1 carry on and 1 personal item thing overhead bin space wouldn't be a problem. Every airline I fly on there are quite a few people with 3-4 items and the GA's just let them on the plane even though that very same GA just made the announcement over the PA. And if you do have 2 items, put 1 under the seat in front of you, not both in the overhead, but FA's don't enforce that, even though they just made an announcement to that effect.