Add the chopped Romaine to a lunch container. Top with the whole grape tomatoes, diced avocado, and sliced cooked chicken strips.
Pack the Dressing
Add the Ranch dressing to a small lidded container and place it inside the lunchbox.
Pack for Lunch
Close the container and refrigerate until ready to pack. Place inside an insulated lunch bag with an ice pack and keep chilled until lunchtime. Add the dressing just before eating.
Notes
Nutrition information is calculated without the dressing.