How do I set up variable usps rates

[PALOMA-Hayes]

Im selling books and other items. The books can be shipped using media mail which is pretty inexpensive but it’s only for books and not for other items I sell. If a customer buys a book and say a coffee mug the shipping price defaults to media mail even though the shipping for the two items should be 1st class package or priority. Is there a way to set up shipping so it defaults to the right shipping depending on the group of items a customer buys?