I'm more comfortable leaving my bag in the coach overhead rack (unlocked) rather than in the downstairs bag area or the baggage car. I don't see he people around me as a threat, but rather as helpful neighbors. After the first half hour, they know me and I know who they are. If someone came in and looked thru my luggage when I was away they would say something or at least be suspicious. I'm not carrying the crown jewels, after all. Its only a $100 carry-on with some clothes and toiletries inside. Even in the worst-case scenario, its all replaceable and not worth loosing any sleep over. I'd rather relax and enjoy my trip than worry about theft.