How can I set up USPS Shipping to have options given only if a certain amount of items are being checked out?

I'm using USPS for shipping and I want it to use a small flat rate box if there are lets say 5 items in the cart. Then, if there are more than 5 it would only give the option of medium flat rate box. Then finally, more than 10 a large flat rate box. How could I set the USPS shipping on magento to do this?

I'm on base Magento 2.3

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