So here's the good news for passengers -- airlines are making more room for carry on bags. With airlines charging for checked bags, passengers are packing their items in carry on luggage. The bigger the better they figure.
With most airlines restricting carry ons to 22 inches by 14 inches by 9 inches, that's what people are carrying. And although allowed, many times they won't actually fit in the overhead bin, wheels in. So the bag is turned sideways and takes up the space of two bags.
Because of that airlines are retro-fitting plans so the bins can hold the bigger bags wheels in. Larger racks and curved doors make it possible.
As a warning most international flights don't allow bags that big, so check before you travel.