Being that the measurements are a little sketchy, I was a little worried about the strict airline policies on carryon luggage - especially United.  I was able to travel to Mexico with this no problem. It also fit easily in the overhead bin. The zippered expansion area allows for the bag to compress somewhat - just don't over fill it because the bag may not work in the little measurement bin.  I used this with pretty compression cases I also purchased from Amazon and was able to pack a ton of clothes, bathing suits and sandals with no problem. I had to google a tutorial on how to change the lock but once I did, it was simple. Love steel blue so this suitcase makes me smile in every way.