Why can't I track a USPS First Class Large / Flat Envelope shipment?

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Large Envelopes / Flats are serviced by USPS First-Class Mail. The USPS does not provide tracking on this service. You can contact the USPS for more information.

Difference between First-Class Mail and First-Class Package

First Class Mail:

This service includes a package type called "Large Envelope/Flat".

This is essentially a flat envelope you would use to ship documents. It is the least expensive service you can get with USPS through ShippingEasy and it is not eligible for tracking services. Learn more.

First Class Package:

This service includes a package type we refer to as a "Thick Envelope (3/4")".

Often used for padded envelopes, it can be used to ship documents or thin objects that are less than 3/4" thick. It can be a little more expensive, but it does include tracking.

Even though USPS does not include tracking on the very cost efficient First Class "Large/Flat Envelope", they do return an unusable reference number when a label is purchased. We agree it’s confusing to all of us, including your buyers. So, we have hidden it across the board: SHIPMENT HISTORY and Shipping Confirmation Emails will not include this fairly unhelpful number.


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Related articles:

What is a First Class Large Envelope/Flat?
What is First Class Package Service?
What is USPS Delivery Confirmation?
How to: Send a Shipping Confirmation Email to my customers
How to: Create a custom Email Template and save it to your store


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  • Avatar
    Nancy Jacobs

    What is happening to First Class Mail.  It is taking days, and sometimes weeks, for the mail to be delivered to the designated party.  This is extremely frustrating!!!  I sent a letter from Central New York to Florida and it took 2 weeks and 2 days to arrive.  Extremely poor service!!!!!

  • Avatar
    Tom K. [ShippingEasy]

    Hello Nancy,

    I'm sorry to hear that your First Class packages and mail are taking longer than expected. I definitely understand how frustrating that can be especially with your customers having to wait even longer for their packages. Since it is First Class, it is considered the least expensive service you can get with USPS through ShippingEasy. That means that there is a chance it can take longer than usual. If you are wanting it to be shipped quicker, I would recommend shipping it via Priority Mail so that way, it'll cost a little more but it'll give you the peace of mind with both tracking, included insurance and a shorter time to get there.

    Please let me know if you have more questions!

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