I do bring in UnCrustable PB&J sands, Capri Sun juice for kids, I make turkey cheese, or ham cheese or tuna, 1/2 size cans or pepsi, popcorn in a Disney bucket, never had a problem. I usually stick it at the bottom of the stroller or backpack and pile jackets on top. We usually eat at that little corner behind the Matterhorn with tables and the Ducks. I see a lot of families eating there. Just don't overdo it and you'll be fine.