Keep up to date with USPS rates and requirements as of January 2026. We’ve created this quick-view cheat sheet to provide the most relevant postage information.

From sizing requirements to pricing charts, this double-sided reference sheet offers a quick and easy overview of postal information.

• Minimum and maximum dimensions and weight for letters, flats, and postcards
• Presorted First Class
• USPS Marketing Mail Letters
• USPS Marketing Mail Nonprofit Letters
• USPS Marketing Mail Flats
• USPS Marketing Mail Nonprofit Flats

You can view our postal price rate chart online, or for a PDF version that includes the dimension information: