Now that another summer is heading toward an end, we're on the lookout for lunchbox-friendly foods that can withstand a morning without refrigeration. Insulated lunchboxes help, as do ice packs. But ice packs are heavy, and they get lost. A couple of judiciously frozen items can do double duty keeping your lunchbox cold: Frozen water bottles or frozen packs of applesauce or yogurt keep food cold and ought to thaw out by lunchtime. Otherwise, here are our top 10 no-fridge lunchbox foods.