I am flying a lot of Delta CRJ-900 flights, and my Briggs Riley U-175 Carry-on garment bag does NOT fit in the overhead compartment. I am looking to buy a smaller carry-on bag that WILL fit the Delta CRJ-900, I see lots of thread history of people bringing their rollaboards on to Delta CRJ-900, but not a lot of sharing the brand and model of bag.

Theoretically my current bag is 9" deep, but in reality it is 9.5" empty, and 10" packed which despite my best efforts, was not fitting.

Most bag manufacturers seem to stretch the truth on their dimensions, so I am looking for real world experience of those who travel regularly and use the overhead compartment, what bag do you use? I want to max out the size of bag I can buy, so far I have found the TravelPro FlightCrew 19" should fit, but at 19x14x7 that will be tight for a suit. Ideally I find a real world 21x14x8 carry-on.