On Mondays I haul in fruit for the week--4 bananas, 4 apples, and 4 oranges.
Then daily I make a sandwich and carry it in a jersey or jacket pocket.
When I work longer shifts--for instance keeping the library open late last night for the election--on the Monday of the week I'll also take in a container of leftovers for dinner. I cook on the weekends and eat the second portions through the week, so it's simply a change of dinner venue.
Last night was soba noodles with pork, shiitakes, and bok choy.