If you manage to score one of the coveted airport wall outlets during your next layover, Innergie’s mCubePro ($89.99) will enable you to charge two mobile devices at once. The universal adapter, smaller than a business card, is designed to simultaneously accommodate a laptop and either an e-book, smartphone, game console, mp3 player or GPS. When you’re on the move again, connect it to an airplane power socket or a car cigarette lighter; myinnergie.com.Handout