Originally Posted by
Jarvy
All airlines have size and weight restrictions on cabin baggage, its just that very few have enforced them
Apart from other considerations, airports would grind to a halt if there was a requirement to weigh every carry-on at the gate.
In my experience, on the rare occasions where I've seen a passenger pulled over it's been because the bag was very obviously outsized. If your carry-on is clearly within the regulation size you would be very unlucky indeed to be stopped for it to be weighed.