I would make him a salad and have the dressing in a separate container. Put it in one of those lunch bags that are insulated and allow ice packets to keep the food cold. Other options are hardboiled eggs and a handful of nuts on lighter days. I eat a lot on the road and there are so many better options than just packing a sandwich.
"If man made it, don't eat it" - Jack Lallane
People say I am on a "crazy" diet. What is so crazy about eating veggies, fruits, seafood and organ meats? Just because I don't eat whole wheat and processed food doesn't make my diet "crazy". Maybe everyone else with a SAD are the "crazy" ones for putting that junk in their system.