There are alternatives. Just meat and cheese rollups without the bread. Cold shaved roast beef by itself is good. Heck cold hamburger patties are good. Pork rinds can substitute for potato chips. The Mac's brand at Walmart are really good and my favorite are the salt and pepper flavored. Wife likes the vinegar and salt flavored, but they are a bit stout for me. A few roasted pecans and a small square of 85% chocolate for a bit of a treat.

It is doable in a lunch box, just takes some minor changes.