Originally Posted by kochleffel

Will a metal travel mug (Contigo brand) give me a problem?

I don't need it while in transit, so I'd prefer to carry it in my checked bag. But if it's going to have to be taken out for inspection, I'll probably put it in my carry-on. In principle I don't object to their opening my checked bag if they must, but in practice I don't trust them to repack it accurately.