Make sure you're using the correct postage for your mail with the First-Class Mail Shape-Based Template from Stamps.com. Just place your mailpiece in the corner of this guide to determine whether your mailpiece is a postcard, letter, non-machinable letter, or package.

• Our color-coded design makes determining mail types easier than ever
• Thickness slots help you determine if your mailpiece is a letter, flat or package
• Guide can also be used as a ruler - accurate to 1/8"
• Guide can be used to determine USPS First-Class retail rates only