Prep lunches?

When it comes to eating right, I am the weakest when I am at work in the afternoon. It's when hunger, stress and exhaustion usually hit the hardest and I am the most tempted to eat something bad. That being said, I am looking for ideas for lunches that are filling and portion-controlled. I would prefer these recipes can be made the night before or frozen. Also, I live without a dishwasher - so crock pots and recipes that use many dishes are also no preferred.

Does anyone have recipes or sites with recipes they like for this? I have combed through Pinterest so much and found few that are fitting.