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  A Customer's Guide to Mailing
   
  Introduction
  What Are You Mailing? Domestic
  What Are You Mailing? International
  Choosing a Service for Mailing
  Adding Extra Services
  Examples of Smart Choices
  Addressing Your Mail
  Preparing Packages
  Tips and Tools for Measuring Letters and Large Envelopes
  Tips and Tools for Measuring Packages
  Flat Rate Quick Reference
  Sending and Receiving Mail
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  Tips for Frequent Mailers and Small Businesses
     
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What Are You Mailing? International
   
 

This picture shows a postcard.

This picture shows a letter.

This picture shows a large envelope.

This picture shows a package.

Postcards
Maximum thickness 0.016 inch

Letters
Maximum thickness 1/4 inch

Large Envelopes
Maximum thickness 3/4 inch

Packages
Maximum dimensions vary by Country

Mailpiece Dimensions

SHAPE   LENGTH HEIGHT
Postcards minimum
maximum
5-1/2 inch min.
6 inch max.
3-1/2 inch min.
4-1/4 inch max.
Letters minimum
maximum
5-1/2 inch min.
11-1/2 inch max.
3-1/2 inch min.
6-1/8 inch max.
Large Envelopes minimum
maximum
11-1/2 inch min.
15 inches
6-1/8 inch min.
12 inches
Packages Maximum dimensions vary by Country