http://travel.usatoday.com/flights/story/2011/06/Packing-tips-avoid-flying-nightmares/48363114/1 When enchilada juice leaked from his carry-on bag onto a passenger next to him, frequent flier Joseph Cooke knew it was time for a change in the way he packed. Cooke, a security consultant in Jamul, Calif., says he didn't properly wrap and pack six beef-and-cheese enchiladas he bought at a Mexican restaurant before his flight a few years ago from San Diego to Charlotte. "I put them in my overnighter that went into the overhead bin, and they leaked when someone opened the bin, dripping enchilada juice on the middle-seat passenger somewhere over St. Louis," Cooke says. "She was not pleased." For many business travelers, deciding how, what and how much to pack for a trip can be a hardship. It's also become harder to pack, because many fliers are limiting themselves to one carry-on bag to avoid escalating checked and overweight bag fees. Add the burdens of bags with items that might be challenged by suspicious security screeners and fitting bags into overstuffed overhead bins, and a trip can turn into a traveler's nightmare. Frequent business traveler Michael Gregurich of Manitowoc, Wis., emphasizes the cardinal rule: "Don't overpack."