Originally Posted by JoeUT
It's an inconvenience because you, and others with wearable armoires, take up more space than is allotted to you, so those who can be bothered to carry appropriately sized bags end up having to check theirs because there's no space left. Dick move, however you want to explain it to yourself.
I certainly appreciate the kind words, but just because bags don't meet the printed dimensions doesn't mean they take up more than the allotted space. I carry a duffel instead of a hard-shell rolling bag. It's longer and skinnier than the printed dimensions, and I can fit more into it, but it doesn't take up extra space in the overhead bin of a decent-sized plane, because the overhead bins are deeper than the printed directions. Hell, it might take up less space, because it's skinnier. On the puddle-jumpers it won't fit in the overhead bin, but it goes just fine under the seat, and they have to gate-check half the plane on those anyways, because they only have enough bin space for about half as many passengers as the plane holds.
One time I did bring a bag that didn't fit into the overhead. It was a new bag that I'd never flown with before, and I've never flown with it again. But as long as one bag fits (longways) in the overhead bin and the other (the "personal item") fits under my seat, I don't see how it should bother anyone whether it fits the airline's printed dimensions. And unless there is a good reason, I'll keep doing it as long as the airline lets me.