Annie,
No flames or offense intended, but do you know how easy it is to break into a piece of luggage when it is locked? My 9 year old can pick most of the luggage locks (including the combination kind) within about 1 minute. Before you ask me why (and no, he's not in training to be a professional thief), I'll explain. He went away to camp (with a footlocker). After lecturing him (a long time) about being careful not to lock his keys in his locker...he did it anyway. His camp counselor (again, not a thief...but an experienced counselor who helps kids solve problems) showed him how to pick his lock.
Then, just for fun, he and his buds at camp figured out how to pick most of the other locks including "spreading" the numbers on a combination lock. OH...and if you're talking about those TSA locks, those are a joke...I can even break into those (and I can't open a "childproof" pill bottle!).
Seriously though. If you are taking valuables, please either lock them in your safe or take them to the front desk to be locked up. A few minutes of hassle to stop at the front desk will save hours of hassle with filing a police report and then not having your stuff. I learned the hard way...had a digital SLR (really) stolen with about 600 pictures on it! Losing the camera bugged me a lot....losing the pictures though, that was horrible!
Karen