Think you won't lose valuables if you check them in your bag? Think again. The value of property reported missing from checked bags between 2010 and 2014 is a whopping $2.5 million, according to a recent report by CNN. And that's not the only thing that can go wrong when you check a bag. Check out the following tips to help you avoid common pitfalls and ensure that your luggage -- and you -- arrive in one piece.