Why you shouldn't use Medium or Large Flat Rate Boxes
The Priority Mail Medium Flat Rate Box and Large Flat Rate Box are up to $4.85 and $9.53 more expensive than using your own box.
Learn more about USPS Priority Mail Cubic: www.pirateship.com/usps/priority-mail-cubic?utm_source=youtube&utm_medium=video&utm_campaign=noflatrate-descrip-click
See more price comparisons between Priority Mail Flat Rate and Cubic: https://support.pirateship.com/en/art...