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

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.

  1. For example, "First Class Mail".

  2. Set the "IF" condition to Order weight then select Is less than and enter in 15.9 in the "oz" field.

    if order weight is less than
    • Order weight | Is less than | 15.9 oz

  3. Set the "THEN" action to Set shipping preset to the First Class Mail saved preset.

    then set shipping preset first class mail
    • Set shipping preset | First Class Mail


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