How do I ship up to 16 ounces using First Class Mail?

Within ShipStation, it is possible to ship First Class Mail Domestic Packages weighing up to (but not including) 16 ounces.

Prior to January 17, 2016, the First Class Mail Package Service had a 13 ounce limit unless you had a Commercial Plus Pricing perk with the USPS.

Stamps.com will accept a maximum value of 15.99 ounces, and Endicia accepts a maximum value of 15.9 ounces.

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