---
source_url: "https://curtsyapp.com/help/shipping_selling/can-i-use-usps-provided-flat-rate-boxes-"
title: "Selling > Shipping > Can I use USPS-provided \"Flat Rate\" boxes?"
mirrored_at: 2026-08-23T01:32:22.244Z
host: curtsyapp.com
cited_in_42a: true
mirror_canonical: "https://index.42a.ai/curtsyapp.com/help/shipping_selling/can-i-use-usps-provided-flat-rate-boxes-"
---

> **Original source:** https://curtsyapp.com/help/shipping_selling/can-i-use-usps-provided-flat-rate-boxes-

In short, no. USPS has many types of boxes and it can be complicated to know which labels can be used with which boxes -- and easy to get in trouble. Because of this we don't recommend using USPS-provided supplies with any Curtsy label.

If your item is over 1 lb, and it says "Priority Mail" on the label, you can use USPS-provided Priority Mail boxes as long as they don't say "Flat Rate" on them.

However, most items on Curtsy are under 1 lb and ship via USPS Ground Advantage -- these cannot be shipped with any of the USPS - provided packaging.

You can always message us or ask anyone at the post office for guidance if you're stuck!