Can you use flat rate boxes on Poshmark?

No. Poshmark sellers cannot use USPS Flat Rate boxes. Poshmark shipping labels only support approved USPS packaging such as Priority Mail boxes that are not Flat Rate.

What USPS boxes are allowed for Poshmark shipping?

Sellers can use regular USPS Priority Mail boxes, Priority Mail Tyvek envelopes, or their own plain boxes when shipping on Poshmark.

Why can’t you use flat rate boxes on Poshmark?

USPS Flat Rate boxes require Flat Rate postage, which is different from the discounted Priority Mail label provided by Poshmark.

Can you use Priority Mail boxes on Poshmark?

Yes. Standard Priority Mail boxes are allowed, as long as they are not labeled Flat Rate or Regional Rate.

What happens if you use a Flat Rate box anyway?

Using a Flat Rate box may result in postage due, delayed delivery, or the package being returned to the sender.

Can you use your own box for Poshmark shipping?

Yes. Sellers may use plain, unbranded boxes as long as the package meets USPS size and weight requirements.

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.

The Power of Poshmark Automation

Closet Assistant is designed to keep your closet active — exactly the way the algorithm prefers — without you spending hours manually sharing.

With features like:

Automatic closet sharing
Party sharing
Return sharing
Offer automation
Daily share scheduling
iOS app + Chrome extension support

Closet Assistant makes sure your listings stay fresh, visible, and boosted in the algorithm 24/7.

You focus on the SEO part — titles, descriptions, photos, pricing — and Closet Assistant handles the share activity that keeps the algorithm happy.

You create the optimized listings.
Closet Assistant keeps them alive in search.

This is the winning strategy for 2025.

Download Closet Assistant and experience the power of automation today.

iOS App: Available on the Apple App Store
Chrome Extension: Perfect for Mac & Windows users

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Welcome to our blog!

Hello! We are Meghan and Ryan; we have been resellers for over 25 years. Our tips guarantee you will learn from our experience as sellers. We share our knowledge of building a full-time business throughout our blog post.

In 2019, we started Closet Assistant, which offers a series of automated tools for Poshmark sellers and resellers. The main components of Closet Assistant are its auto-sharer Poshmark Bot and Cross lister. The Poshmark share bot will share your closet and other Poshmark users’ closets with a single click. With our Poshmark bot, you will no longer need to spend countless hours a day sharing your closet. Spend more time where it counts in your Poshmark business! Unlike other services, Closet Assistant is run by a husband and wife team who are actually resellers on Poshmark. Try our auto closet sharer today for a free 7-day trial!