Upon setup of your account, a variety pack of the Priority Mail Flat Rate Boxes will be ordered from the US Postal Service (USPS). Arrival may take up to 10 business days though it’s usually much quicker. The variety pack contains all sizes of the boxes (small, medium, large) so you have every size to choose from. If you know you will only need a certain size, contact 123 Compliant Logistics and we can certainly order your specified size. If you need boxes sooner, The Priority Mail Flat Rate Boxes are available free-of-charge in the lobby of any US Post Office or approved postal provider.