I have the large size Strong Bags cooler and a variety of little tupperware containers and also bring stuff in zip lock bags. I always have a big supply of a variety of all kinds of fruit (plums, black olives, sweet pickles, oranges, cantaloupe, watermelon, fuji apples, peaches, pears, berries, bananas, grapes, etc.), some cut up veggies (carrot sticks or baby carrots, jicama, slices of bell pepper, and cherry tomatoes a must) and healthy dips (usually yogurt based dips), tuna/tuna salad, an assortment of Nature Valley's granola bars and Nature Valley Granola Thins, trail mix (that I make myself), a variety of all kinds of yogurt, jar of extra crunchy peanut butter, bagel chips, an assortment of different crackers, melba toast, and different kinds of cheese, granola, the Campbell's soups that come in the foil pouches (which are really delicious and unusual called Campbells On The Go), biscotti, cottage cheese, some pita bread, canned salmon, Oscar Meyer Carving Board chicken and turkey, roasted nuts, different kinds of hummus, instant oatmeal and instant malto meal, some multi grain bread, hard boiled eggs, sliced up baked chicken breast, applesauce, tropical dired fruit, sliced roast beef or corned beef from a deli, a variety of fruit cups, chicken or turkey salad, waldorf salad, pasta salad, artichoke salad, Uncle Bens instant rice packets in foil pouches (huge variety of them available) raisins, bagel and cream cheese, whole wheat tortillas, an avocado, shredded coconut, cucumber salad, wheat thins, the small bottles of V-8 veggie or fruit drinks, small bottles of apple juice and orange juice, healthy cookies ( wife makes me these oatmeal cookies that have pecans and coconut in them for instance), the Honey Maid peanut butter and chocolate gramfuls, some banana nut bread or muffins. Just for some suggestions of what I eat and drag along on trips.
You can eat much healthier, cheaper, eat when you want/need to, meet whatever dietary needs you might have, won't be "food bored", and have much better food than any fast food place, food at airports or FBO's etc., and have what you like and a big variety of easy to take along food. I like a decent meal at a decent restaurant or room service, but when you are tired, not in the mood, it's late, want to stay in watch tv or read and relax, don't feel that social or whatever, you can have food to eat along the trip all day or evening and for when you land or on several legs. You can really have a lot of great and fun food on your trips. Mix it up....the more variety, the better. You can have meats, salads, fruit, veggies, cereals, carbs, proteins, snacks, everything you need.