We use the TSA locks, although I really don't know why as we only pack clothes in the luggage anyway. Anything of value is in our carryons that we take on the plane with us. We do that "half and half" clothes thing though, half mine and half his in each piece of luggage if we're taking two. We had one piece of luggage go missing on our flight home from Florida last February. They did find it and returned it to us the next day (after asking if we could "drive back for it" when they found it and we told them "no, it's a 2-1/2 hour drive." They lost it, they can deliver it, which they did.