agree, its all about being able to store my carryon. I usually have this only if I don't have any luggage to check. so..if there is no space left over, it defeats the purpose of having only the carryon (a lot of time wasted waiting for luggage..if it ever makes it...recently completely lost a bag on an international trip). frankly, if airlines were efficient in luggage delivery and did not lose bags ...most people would probably check in luggage. but with the current state of luggage handling, I would try to avoid checking luggage if possible.