The only reason I bother with a lock on my (zippered) luggage is to keep the double-zipper ends together and keep it from working itself open as it bounces arou

The only reason I bother with a lock on my (zippered) luggage is to keep the double-zipper ends together and keep it from working itself open as it bounces around the baggage handling equipment. Like most things concerning security in general and airport security in particular, it's a sham, meant for appearances only.