USPS Flat Rate Envelopes
Posted by Doug Sherman (Import), Last modified by Doug Sherman on 21 Jan 17 07:13 PM

The US Postal Service offers Flat Rate envelopes for Domestic and International Priority and Express services.

Our rate engine supports this option for all products except the Mals plugin.

 Item dimensions must be available for all items so that our rate engine can determine if the items fit.  The dimensions of your item(s) cannot exceed 12 x 9 x 0.75. 

2017 Retail Pricing

Service Domestic International
Priority Mail envelopes
(padded)
$7.20 varies by country
Priority Express Mail
envelopes
$24.95

varies by country

2017 Commercial Base Pricing

Service Domestic International
Priority Mail envelopes
(padded)
$6.50 varies by country
Priority Express Mail
envelopes
$21.64 varies by country

2017 Commercial Plus Pricing

Service Domestic International
Priority Mail envelopes
(padded)
$6.30 varies by country
Priority Express Mail
envelopes
$21.64 varies by country

For both Priority and Express Mail International, there is a 4 lb limit on your envelope weight.

If you have the option selected in your AuctionInc account for checking for flat rate envelope eligibilty (Carrier Settings page), the shipping calculator will attempt to use the prepaid envelopes under the following conditions:

  • Items weigh less than the limits above;
  • You have included dimensions for your items;
  • The dimensions of the items combined do not exceed the dimensions of the prepaid envelopes;
  • The rate for the prepaid envelope is less than the calculated rate.

For more information see the USPS site:

Priority Mail
Express Mail 

If you are subscribed to ShopCart, your customer has selected Priority or Express mail, and at least one package in the order qualifies for the flat rat envelope, you will see "FRE" in our shipping "item" in your PayPal or Amazon order detail.

If you are subscribed to one of our plugins. the code will be in the Packaging Detail in your order.

(If there are multiple packages that have been packaged into any of the flat rate envelopes or boxes, the code will read "Multiple FRB". You may want to put the order items into your cart and use our Shipping Inspector to view the exact packaging that was rated.)

These codes are also returned in our Shipping Rates API.

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