Why is most cereal inside a plastic bag inside a cardboard box, when it doesn’t seemingly need the cardboard box?

Question

Why is most cereal inside a plastic bag inside a cardboard box, when it doesn’t seemingly need the cardboard box?

In: 4464

Answer 1

The bag stops the cereal from going stale, because a cardboard box isn’t airtight. The box keeps the cereal from getting crunched to bits, and is probably better for advertising (boxes can stand upright on a shelf for more visibility, bags cannot). Hence, box + bag.