Kharon
Contributor
9x14x22 is the max size. The rule is if somehow you can squeeze it into the device, it will be ok.
Might be your rule. Maybe not the rule of the person controlling boarding. Can't tell you how many times I was told I'd have to gate check my 22" x 14" x 9" even though it fit completely inside the bag checker. Some flights are on smaller aircraft and the bins don't hold what is regulation size. Sometimes you get screwed if you aren't in an early boarding group. Some boarding personnel are just pricks.
Also some airlines restrict bags to just less than the 22" x 14" x 9". Puddle jumpers are sometimes 19.6" x 13.7" x 9" - just enough less than the normal size so an additional checked bag can be charged. One airline has a 10" x 10" x 14" limit with no personal item allowed.
Wish I could find one that is 19" x 13" x 9". and without wheels. Might try to remove the wheels from my carry-on.