I'm on campus for most of the day, and since eating on campus is expensive, I would bring leftover dinners with me. Since they would sit in my backpack for several hours before eating, I would use one of the many microwaves on campus to heat it up to kill any harmful bacteria that may be present.
I'm at a new college now, and there appears to be only one public microwave on the entire campus, which makes bringing leftover dinners inconvenient.
The Problem: The food I bring with me will sit around in the temperature danger zone for several hours before eating. Heating it back up and keeping it cool are not very feasible.
The Need: Meals that don't need to be kept cool or heated up. The only thing I can think of is sandwiches, and the only sandwiches I can think of are boring turkey slices on white bread. So, what kind of meals can I make then?