What goes into a tortilla? Pretty much anything. If I have any sort of left over meat I slice it up, add lettuce, onions, tomatoes, grated cheese, and some salsa and presto, a healthy, filling meal. Peanut butter and jelly is great on a tortilla. Lunch meat and cheese, also very good. If you are traveling, hiking, fishing, or hunting a tortilla "roll-up" is handier to eat on the go, packs better, and gets less damage. I roll up whatever is going in the shell then roll that in aluminum foil. If you have health concerns about aluminum, as I do, lay a piece of wax paper or parchment on the foil first so the food does not come in contact with the aluminum.
Tortillas have far more calories than regular, fluffy bread, which is mostly air. More calories in less space at a cheaper price is always a good deal (unless you are trying to lose weight).
Check them out and use your imagination.