Pictures and more pictures! You know how it goes.
This lunch bag oddly looks like a very realistic picture, taken by Olaf. Anna is kind of looking off to the side awkwardly distracted, Elsa is staring deer-in-headlights directly at the camera, and Olaf... looks great. Elsa and Anna are like "Let's take another picture!" and Olaf is like "What? It's fine!" Brilliant.