Spread the peanut butter on both slices of bread. Spread the jelly on one side and close the sandwich. Slice in half or into 4 pieces.
Fill the bento lunch box:
Place the PBJ sandwich pieces inside the main compartment of a bento-style lunch box. Add the apple slices and the baby carrots, packed tightly inside. These can go in the same compartment as the pbj.
Place the berries, sliced strawberries or blueberries, in a separate compartment, away from the sandwich, since these contain a lot of moisture. Close the bento lunch box.
Pack for school:
Place the bento lunch it inside a lunch bag with an ice pack, if necessary.