There are dozens of scenarios in which an emergency snack might come in handy. You arrive late at a hotel with no room service. You miss your train and find yourself stuck at a country rail station where live pigeons are the only source of protein. Your late-night connection is canceled and all the shops are closed at the airport. Protein bars, nuts, and other items that don't get mushy or need to be refrigerated are perfect snacks to keep stashed in your bag. And let's face it, an on-the-go snack is never unwelcome, even if you sail through your trip food-emergency free.