Postage for Large Envelopes & Flats

Looking to mail a large envelope? Here, you'll find up-to-date rates for mailing flats via the USPS as well as information on letter dimensions, requirements, and more.

The USPS Flatrate Envelope Rate

Understanding USPS Flat Rate Shipping: Costs & Speeds

Current USPS Postage Rate Charts - simple tables

Postage for Large Envelopes & Flats

How Many Stamps Do I Need?

Beginner's Guide To USPS Package Rates

What Priority Mail Flat Rate® Envelopes Are Available?

Current USPS Postage Rate Charts - simple tables

This pack includes 200 9x12 Flat size Certified Mail Envelopes. Each envelope holds up to 63 pages of paper, is bright white in color and includes the

Certified Mail Envelopes Flat Size 9x12 - Pack of 200 Envelopes for Certified Mail Labels

Wedding Stamps (USPS Postage Stamps)

USPS Shipping Template, Mail Measure, Mail Sizer, Slot Template, Letter Envelope Size Guide, Measuring tool for USPS letter flat large envelope : Office Products

What are the compatible postage and package types? : Chit Chats

2023 USPS Postage Rate Increase — Little Postage House

If I'm shipping a package with a Mercari USPS Priority mail label is it ok to use this padded envelope? I've seen lots of things about them only accepting certain types of

Summary of Domestic Changes