Postal Letter

Can u mail USPS PRIORITY items in your own box?

I am not referring to flat rate usps mailings which I know have to go on their own box. I am talking about NON- flat rate usps items, the ones you mail according to weight and zone.

Public Comments

1. You may use any suitable packaging to send Priority Mail through the USPS. There is no requirement to use only the USPS provided packaging, except when you wish to use the Flat Rate. There are labels that are used to indicate that a certain package has been paid at the Priority Mail rate that should be applied to the container.