Our aircraft can hold up to about 170 people or thereabouts. Configuration is, three people on each side of the aisle. Overhead bins extend about three rows, give or take. So if you think about it, 9 people should be sharing one overhead bin. But those bins can really fit only up to 5 bags (if those bags fit in the bag sizers most airlines have, and are properly positioned). So if every single person brought a carry on bag, even if those bags are the proper size and are placed correctly, there would be a serious shortage of bin space.

Sometimes your bag is just not gonna fit, even if everyone followed the rules.

As for airlines enforcing the rules — we do. TSA demands that we do, and has set up fines for noncompliance. I have personally carried the sizer down to the aircraft door and made passengers stick their bags in. But of course people get upset that we make them check bags that don't fit, and we always hear "But it fit the last time." Or, "TSA let me through with it" or "I don't want to lose my bag".

Now, if you get on last and your bag just doesn't fit — then sorry. That's the risk you take if you board late.

If my bag fits under the seat, I put it there even if it is somewhat uncomfortable for me and I have to put my feet on it. Also, I think we can all agree that there are many, many reasons why people do not check bags that has nothing to do with selfishness or cheapness. Perhaps if bags didn't get lost, items were not stolen from bags, bags were not ripped or destroyed, we didn't have to wait 45 minutes at baggage claim and the airlines actually cared about our things, people would be more likely to check.

I do agree with all posters that it would be easier if the airline enforced the limits on bag size and number of bags.

However, when someone get's on at the last minute and starts yanking bags out of the bin, that's where I draw the line. Bin space is first come first served. No bin space is reserved for a certain area. I try very hard to keep the bags situation under control as eveyone is boarding; ie turning bags to make more room and keeping bins open that DO have room. But full is full and if you get on last and there's no room, then you get to check your bag, simple as that. There is no additional charge for gate checking. If there is a confrontation after that, then somebody gets to spend a little more time in the airport to contemplate their dilema.

I would think that an exception should be made for those with medical equipment, etc… It is quite understandable that you would have extra to carry on.

Likewise, I understand your concern of checking anything of value. When I travel, if at all possible, I do not take anything valuable with me….even clothes. And, when I absolutely have to take valuables…(brand suit for an important meeting, or camera for vacation…I will wear the suit, or carry it on with my laptop….but, make sure that I minimize all other carry on items…for the convenience of others…and, for myself.