Try to get tuba wear with many compartments to allow you to carry snacks too all in the one lunch box. This will save you leaving a lunch box behind or loosing it along the way or at work.
Try to have a different snack and lunch every day, this will ensure you are getting a wider variety of nutrients. Here are some my favourite healthy snacks:
Apple/carrot/celery with Nut Butter
Carrot/Celery with hummus
A piece of fruit and a handful of nuts
A handful berries with coconut yogurt
Oat cakes with Almond or Hazelnut Butter