Any recipes for packed work lunches?

So I work in retail and I typically get 15~20 minute breaks so that’s when I eat my lunch or dinner.

Food needs to be something that I can eat cold right out the fridge or something that’s microwaveable.

Edit: My job is is pretty physically demanding I’m lifting crates, milk gallons, and I’m on my feet for hours on end. I was thinking about recipes with plenty of protein and energy boosting foods.

I look forward to hearing your suggestions.

bon appetit