To ensure you receive the flat rate pricing, you must follow these USPS regulations:
: Most retail locations have a dedicated area in the lobby where you can pick up a few boxes for free. High-volume types like Medium and Large boxes are almost always in stock.
You can obtain official USPS flat rate packaging through these official channels:
: You cannot turn the boxes inside out or alter their shape. The box must close normally without bulging or using excessive tape to force it shut.