Ship Packages Less than 15.9 oz via USPS First Class Mail - Shipping Rules | Guide

One of the least expensive shipping methods for USPS is shipping via First-Class Mail. Packages equal to or less than 15.999oz are eligible for this shipping method.

USPS accounts connected to ShippingEasy currently allow a maximum value of 15.99oz. As long as the package weighs less than 15.999oz, the USPS will accept the shipment at 15.99oz as having accurate postage.

If you have the correct weights for your SKUs on your store platform or are using our Product Catalog to assign weights to your SKUs (and total order weight), you can easily make this shipping selection automatic.


  2. Click the blue Add New button.
  3. In the field Rule Name, enter a name that describes this rule, such as "First Class Mail".
  4. Set the "IF" condition to Order weight is less than 15.9 oz. View all available conditions.
    Order Weight | Is equal or less than | 15.9 oz
  5. Set the "THEN" action to Set shipping preset to "First Class Mail": 

    Set shipping preset
     | First Class Mail
  6. Save your new rule and you're done!


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  • first_class
  • weight
  • first_class_mail
  • 13
  • 15.999
  • 15.99
  • settings shipping_rules
  • settings shipping_rules edit
  • settings shipping_rules new
  • #pendo
  • ounce
  • answerbot_article_public