Storing pizza for travel requires a strategy to prevent it from becoming soggy, stale, or a safety hazard. If you are traveling for more than two hours, the "safety rule" is to cool the pizza down before packing; placing a hot pizza in a closed container creates steam, which ruins the crust. For the best results, wrap individual slices tightly in aluminum foil or plastic wrap, or stack them in an airtight plastic container with parchment paper between slices to prevent sticking. If you are taking it on a plane or a long car ride, place the wrapped slices in a soft-sided insulated cooler bag. This keeps the temperature stable and contains the aroma, which is a courtesy to fellow passengers. To revive the pizza at your destination, avoid the microwave if possible; instead, use a skillet on medium heat with a lid for a few minutes or a toaster oven. This restores the crispness of the crust and the melt of the cheese. If you must carry a whole box for a short trip, try propping the box lid slightly open with a toothpick to let out steam, and always keep it flat on the floor or a level trunk space to prevent the toppings from sliding off.