Make a base with your mixed greens in a lunchbox with compartments. Layer the cherry tomatoes on top of the lettuce. Keep falafels in a separate compartment.
Dressing:
Fill a small lidded container with the salad dressing. Wait to drizzle salad dressing until right before eating.
Pack it for school:
Pack the salad and the dressing inside a lunch bag, with an ice pack to keep it cool.