Whether the airline loses your backpack, or it gets misplaced somewhere along your journey, its a good idea to have a photo of your backpack and day-bag. Its much easier to show a picture of your backpack you have printed out, or the photo saved on your camera, than trying to describe the specific color and size of your bag to someone who may not even understand the language you’re speaking. A picture is worth a thousand descriptive words about your backpack and time is of the essence when it goes missing.