Buy a bright suitcase, or put colored tape or ribbons on yours, so it's easy to keep track of at the airport.
Watch your bag disappear into the X-ray before going through the metal detector.
Don't forget to keep your boarding pass in your hand as you go through the metal detector. If you leave it in your luggage, the screeners will have to fast-forward on the belt, potentially giving more people access to it.
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