Can I Use Flat Rate Boxes For Poshmark?

NO

Poshmark introduced new shipping rates as of September 2025. Poshmark discontinued the use of Priority Mail packaging. You can no longer use Priority Mail packaging to ship your Poshmark items. 

Poshmark’s new shipping rates are based on the Ground Advantage rates. The USPS will have ground advantage packaging materials available exclusively for Poshmark sellers. See details below on how to order supplies. 

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Other Blog Post

Our blog is filled full of Poshmark Tips! Check out our other post to learn more!

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