Can I use a Priority Mail Box inside a blank poly mailer and ship Ground Advantage?

[usa_vintage_goods]

Essentially using the Priority Mailbox to secure an item inside the poly mailer. This will be shipped as Ground Advantage.

[kensgiftshop]

No, Priority Mail boxes are for Priority Mail.

[wastingtime101 · Accepted solution]

Absolutely not @usa_vintage_goods . Priority boxes can only be used when you pay Priority postage rates. On top of that, "flat rate" Priority boxes require labels for Priority Flat Rate services.

[ebooksdiva]

No, that is misuse of free shipping supplies that should be used for Priority shipping. 

[714ricki]

Do not use a USPS Priority Box inside a blank poly bag. Invest in some common box sizes & packing materials for your shipping. 🙏