I take a lot with me to work. I am the only person who brings a cooler with me, I carry it everywhere, even on the weekends! Things I usually have in there are:
1. I cook up boneless, skinless chicken breast each Sunday. I make enough for the week. I slice them up into bite size peices and package them in plastic baggies for the entire week. I usually put 5-6 ounces in each bag.
2. Whole wheat hamburger bun with lean, ground turkey breast.
3. Almonds and sunflower seeds.
4. Whole wheat bread with fat free cheese and lean turkey slices to make a quick turkey melt.
5. Tons of cold veggies, I each a serving of veggies with every meal except breakfast.
6. Hard boiled eggs
7. Tons of fruits
8. My protein shakes
9. Natural peanut butter for toast with pb and sliced banana on it
10. Fish
11. Brown, long grain rice
I am sure there is more that I am forgetting, but that should give you some ideas.