22" x 14" x 9" are the allowed dimensions. If you expand it, or even overstuff, you will not meet the 9" depth allowed. Some international airports (especially in Asia) have even a smaller size limit.
"The test of a first rate intelligence is the ability to hold two opposed ideas in the mind at the same time and still retain the ability to function."
F Scott Fitzgerald
Silversea Silver Explorer (23nts) - Kangerlussuaq, Greenland - Nome, Alaska - Aug 14
Seven Seas Voyager (30nts) - Dubai - Cape Town - Nov 14