PURPOSE OF STUDY The purpose was to know the lowest common denominators worldwide in the hopes of never being denied because of bag size. Because of this, height, width and depth dimensions were all arrived at independently.
H: 48 cm 18.90 in W: 34 cm 13.39 in D: 20 cm 07.88 in
19 x 13 x 8 inches or 48 x 34 x 20 Centimeters. (Andy inserted)
As for weight limitations, I came up with the following:
5 kg 11.02 lbs (a few) 6 kg 13.22 lbs (several) 7 kg 15.43 lbs (common)
I am using presently a 22 x 14 x 9 standard, however 22 x 14 x 8 would be more conservative. I have soft bags; I can stuff the bag into an area that does not allow hard luggage.
This number is conservative, but 19 x 13 x 8 inches, I doubt that this is enforced much, however it could be, the funny aspect is the majority of Airlines Pilots and Airline Attendants violate all this rules and carry too many bags too boot, not good examples for passengers.