Originally Posted by
Clipper801
No, the enforcement system has not been relaxed. If your carry on "looks" bigger than allowed, you will be asked to fit it into the metal frame to confirm the size. If it fits properly into the metal frame, you will not have any problem. If it does not, you will be sent back to the airline check in counter to either obtain a tag or checked as baggage. The entire bag, including the wheels and handles, must fit completely into the metal frame.
HKG security is simply verifying the carry on size much more proactively than many other airports.
Thanks for the info. Possibly it seemed a bit more informal when I was there because there was some rock band about to leave and they were thronged with cheering fans just at the entrance to security. Still gotta have that orange tag, I guess!