How Do I Know If My Carry-on Bag Will Fit?
How Do I Know If My Carry-on Bag Will Fit? So if your airline allows carry-on bags that measure up to 45 linear inches, and your bag measures 20 inches by 10 inches by 9 inches, its measurement in linear inches is 20 + 10 + 9 = 39 inches, so it would be allowed.