I have to pack lunch, morning snack, and afternoon snack for my daughters camp that starts tomorrow. She'll also be attending that school for K and it will be the same. How should I pack everything so it's clear which is which and doesn't take up a ton of space?

She has a stainless steel lunch box with layers for her lunch and I was going to put it inside one of those insulated kid lunch bags. I could use a smaller container for each snack, but I don't know if they would all fit in the lunch bag? Do I need to label them which meal/snack they are for? Should I sent two bags, one for snack and one for lunch?