Does USPS ship large boxes?

Does USPS ship large boxes?

I. The United States Postal Service (USPS) sells cartons up to 20” x 14” x 10”, and offers a couple of service levels suitable for large boxes. Priority Mail packages ship in 1-3 business days depending on the origin and destination. Shipments cannot exceed 70 lbs and must be under 108” in combined length and girth.