Originally ordered the Cabin and it just seemed way too small for traveling with a carryon only. I ended up returning and purchasing the Cabin Plus Titanium. It is the exact same length and width and probably nearly the same depth or maybe even a hair smaller compared to my fully packed Travelpro that has traveled the world with me on planes of all sizes.
I can recall only one time in Europe many years ago that they forced me to check that TravelPro - probably because I overstuffed it on a 4 week European trip. I'll keep y'all posted! I'll be traveling to Central America and Asia soon. I have pics but cannot upload because I have not posted enough times in the forum.