It's in inches, but aren't those sizes right around the normal European carry-on size? My wife and I have a couple of European size carry-ons (a couple of roll

It's in inches, but aren't those sizes right around the normal European carry-on size? My wife and I have a couple of European size carry-ons (a couple of rollers, one medical bag style) and then a couple of American size carry-ons for when we travel to the U.S. The Tumi expandable carry-on bags are nice, and my Tumi laptop bag is normally nice and compact but when I expand it I can hold enough for a few days consulting. The European size Tumi expandable roller cannot be expanded though and be carry-on size. I know this sounds like it would make a boring conversation but when you travel as much as we do it becomes important and is a common topic of conversation with colleagues that also travel.