Anything at all on a 50-cal whole wheat tortilla!
(I like tuna from a pouch and a touch of cheese, sometimes spinach, good microwaved also)
Frozen unsweetened cherries (cool in Arizona, where I also live, AZ Sunset)
Unsweetened chocolate soymilk (no added sugars or sweeteners of any kind)
Fatfree or lowfat cottage cheese with cherry tomatoes (I like red pepper flakes on this for some reason)
Cherry tomatoes by themselves
Sweet potato in microwave (these are often sold wrapped in microwaveable wrappers ... totally portable and you just stick in the microwave, micro and cut the wrapping open, add butter spray or whatever you like and eat).
Cook chicken breasts, freeze individually and take along in cooler to work or errands
Fat free individual bottles of skim milk from convenience store/grocery store
Whole mushrooms from a jar with mustard (tastes like hot dogs)
Olives, fat free or low fat cheese
Some people like the new South Beach Diet individual paks of cookies or crackers (I don't)
Apples and a bit of cheese
Fruit and bottle of skim milk from convenience store (natural sugars energizing)
Triscuits with natural peanut butter
Lots more ...