USPS rates changed on January 17, 2016.
Commercial Plus Pricing on First-Class Package Service was eliminated and replaced with Commercial Pricing. In addition, Commercial Pricing is now available for First-Class Package Service shipments up to 15.999 oz.
NOTE: 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.