Place the tortilla on a flat surface and spread a thin layer of mayonnaise or Ranch dressing over the tortilla. Layer a couple of lettuce leaves on top. Place the tomato slices in the middle of the tortilla, in a row. Top with the shredded or finely chopped chicken and lay the avocado slices on top or next to the chicken. Fold in the two sides and then one end over the chicken, rolling it tightly into a wrap. Slice in half. Place the chicken wrap inside the main compartment of a lunchbox along with some fruit and veggies. Cover with the lid and refrigerate until ready to pack inside a lunch bag with or without an ice pack.
