---
type: faq
title: "How do I make sure my envelopes are USPS compatible?"
description: "To qualify for standard USPS letter rates, an envelope has to stay inside a defined size and shape window. Miss it and the piece gets bumped to a higher ra"
resource: https://www.4over4.com/faqs/envelopes/how-do-i-make-sure-my-envelopes-are-usps-compatible
tags: ["Business Stationery", "faq"]
timestamp: 2026-07-20T18:54:40.856Z
---

# How do I make sure my envelopes are USPS compatible?

To qualify for standard USPS letter rates, an envelope has to stay inside a defined size and shape window. Miss it and the piece gets bumped to a higher ra

Part of the **Business Stationery** hub. See [all faq concepts](index.md).

- Page type: faq
- Hub: Business Stationery
- URL: https://www.4over4.com/faqs/envelopes/how-do-i-make-sure-my-envelopes-are-usps-compatible