Originally Posted by
bocastephen
Why sweat it? If you know you're bag will fit - fairly (lengthwise, not taking extra space) - then let him tag it, and while marching own the jetway, rip off the tag and stow it onboard.
With them scanning all the bags these days, they know what they printed, and they know what they have. I wouldn't expect this to work for long. They'll be after you soon. "Passenger Boca, Mr. Stephen Boca, please ring your flight attendant call button."