Today I saw a guy with his suitcase, his carry on and his huge laptop case and then a fairly big back pack. I have no issues with one carry on rule. But make it an international size for the carry on. You take a flight and then make a connection and then get stuck with your carry on from your previous flight. At least have a universal size instead of each airlines deciding on what the size is. Now with checked luggage it has to be 32kgs or less.