Question: is 20 carry on size?
Answer: Typically, a standard checked luggage size wavers around 27 x 21 x 14 inches. ... Outside of the U.S. the standard carry-on baggage size is smaller (this relates to flights originating outside the U.S. and with a destination outside the U.S.). Here, the rule of thumb is about 21", and NOT the 22" and above carry-on size.