I'm sure this will be of no real use to you, but before my last trip I bought "new" luggage. A vintage 60's Samsonite hard case large suitcase and a smaller matching train/cosmetic case. It's actually VERY roomy and fits a TON more stuff than my last soft-sided luggage. It had the keys and it locks, but I don't know what would happen if it gets randomly selected for a TSA inspection (since the original locks are obviously not TSA approved- since TSA didn't exist in the 60's ).

I'm sure that's not what you were asking, but being the tree-hugging hippie I am, I vowed I wouldn't buy anything new if I could find something vintage and used that would work. And I got lots of "oh, my grandmother had a train case like that" at the airport. Yup, I'm a grandmother stuck in a 40 year old's body.