How to Deliver First-Class Large Envelopes ("Flats") and Letters with Etsy Postage Labels

Etsy partners with Pitney Bowes to offer First-Class USPS large envelopes ("flats") and letters with tracking information included. We’re proud to be the only e-commerce postage label provider to offer this service from Pitney Bowes.

With Etsy postage labels, you can send your orders with large envelopes and letters at discounted rates that are cheaper than sending parcels or using stamps from the Post Office. You can also purchase Shipsurance insurance for these envelopes and letters.

To purchase a First-Class postage label for a letter or large envelope on Etsy, choose either Flat (large envelope) or Letter as the Package type when purchasing a postage label.

What size envelopes or letters can I send using this service?

Envelopes and letters need to be machinable. For USPS, “machinable” means flexible or bendable mail that can be sent through their mail processing machines.

Anything that is sent as flats or letters that is deemed too rigid may result in price adjustments or delivery issues. These non-qualifying packages may also not show tracking.

For example: A metal keychain could be both too rigid, and too variable in thickness, to qualify as a Flat or Letter even if the envelope is within the allowed dimensions.

  • 13oz
  • 15 inches by 12 in by 0.75 in

Read USPS’ guide to flats sizes.

  • 3.5 oz
  • 11.5 inches by 6.125 in by 0.25 in

Read USPS’ guide to letter sizes.

What types of flats or letters can I send using this service?

Envelopes and letters need to be machinable. For USPS, “machinable” means flexible or bendable mail that can be sent through their mail processing machines. 

Anything that is sent as a flats or letters that is deemed too rigid may result in price adjustments or delivery issues.

How tracking works for large envelopes ("flats") and letters

Tracking for First-Class flats and letters is provided through our partnership with Pitney Bowes, not through USPS.

To view tracking on a First-Class flat or letter sent with an Etsy postage label:

  1. In Shop Manager, select Orders & Delivery.
  2. Find the order you’re interested in.
  3. Choose the tracking number.

The buyer will receive tracking emails, and can access their tracking information through their Purchase on Etsy.com or the Etsy app.

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