I had to pack lunches this semester, my classes were all right in the middle of the day with not much of a break between. I have a little cooler thing with removable built in freezer packs that fits in my big class bag. It all stays cold for lunch time.
I am a poor college kid, and I live by myself. I've been buying the biggest fryer chickens I can find (5-6lbs), roasting them, carving them that night, and then eating the chicken meat for the next few days. You could do the same thing with buying chicken breasts or something, I've just found the roast chickens to be cheaper and it makes a ton of chicken that I can do tons of things with.
So with my roast chicken, I make chicken salads, chicken wraps with low carb tortillas (my fave), chicken sandwiches on sandwich thins, or I just pack chicken meat and a few other things on the side such as fruit, triscuits, yogurt, etc.
There are also many low fat/low cal options as far as cheese singles and lunch meat. They're higher in sodium and that junk, but a good option for variety. I put a fat free cheese single (30 cal) and a fat free turkey slice (20 cal) on each half of a sandwich thin (each half is 50 cal). A thin spread of fat free mayo and some veggies. So you have two mini open face sandwiches for less than 250 cal. You can get creative with that stuff too.
I recently discovered a microwave in this random little room in one of my buildings. So, I packed 1/2 cup oatmeal in a tupperware with cinnamon, a tablespoon of chopped pecans, and Splenda brown sugar. I also packed a banana. When it was lunch time, I put water in my oatmeal and nuked it and then mashed the banana into it. It was about 300 cal, but oh so tasty. Banana nut and cinnamon oatmeal
