During the fall or spring, keeping hotdogs cold is not too much of a problem.  During warmer periods, I'd recommend that you freeze the hotdogs and wrap them in several layers of insulating material before placing them deep within your food pack.  There are those that pack in jugs of ice in the food pack to keep things cold.  Of course, you should make an effort to keep the cold stuff out of direct sun light where possible.

dd

BTW:  Welcome aboard.