Two weeks in Europe only in one side, I used the zippered side for dirty clothes.
I have been able to use this as my carry on in all of my travels (except a few regional flights in the U.S.A, where it fits the carry on description but most be checked in at the gate due to airplane size).
United, KLM, Swiss, Lufthansa, British, AirFrance, Aeromexico, American, Delta, South West, Spirit. Non of the airlines mentioned have had any problem with the extra inch shown in the dimensions.
It fits two suits, three dress shirts, two belts, a pair of shoes, ten T-Shirts, four Polo shirts, two jeans, eleven boxer briefs, eleven pairs of socks, a toiletries bag, a 100 ml bottle of perfume, two watches and two pairs of sunglasses. All without using the zippered space but for the shoes only.
Excellent space optimization, Thule.