run

On the go eating

Now, most days I make bento, and have at least an hour to enjoy my lunch. However, on Fridays, I don't get a lunch break. Any food has to be eaten whilst running across my rather large campus.
I've been taking sandwiches, but I'm already getting sick of them (the whole point of bento is not eating sandwiches, darnit!)
So, I'm looking for suggestions on easy to eat on the go food.