Flat Mail Options
First-Class and Certified Options
First-Class and Certified Options
Higher Page Counts Made Easy
USPS Flat Mail is ideal for sending documents with higher page counts.
First-Class Flat
As low as: $2.67 each
Send up to (75) printed pages
Double-sided printing available (duplex)
Documents arrive unfolded*
*No control over the Post Office handling
Mix color and black and white printed documents
Saves costs with impact of color
Add return envelopes — get creative!
Explore our multiple letter options
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Certified Flat
As low as: $9.96 each
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Send up to 75 printed pages in a single envelope
(automatically updates to parcel after 75 pages)
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Track your documents on LetterStream.com or USPS.com
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Your documents arrive unfolded
(except for what the Postal Service might do)
Flats with Electronic Return Receipt (ERR)
Electronic Return Receipt (ERR) option as low as $12.78 each
Flat Packet Highlights
Send multiple documents in a single 9” × 12” envelope. Whether you need economical First-Class Mail or fully trackable Certified Mail, our Flat option makes it simple to send high-page-count documents with confidence. You can mix color and black-and-white pages, include return envelopes, or even choose postcard stock for certain inserts. This versatile flat packet handles up to 75 double-sided sheets.
Frequently Asked Questions
What is Flat Mail?
Flat Mail refers to large envelopes that can accommodate unfolded documents. The standard size for Flat Mail is 9” x 12”, allowing you to send documents without folding them, which is ideal for presentations, contracts, or any important paperwork.
How many pages can I send in a Flat Mail envelope?
You can send up to 75 printed pages in a single Flat Mail envelope. This makes it a great option for sending multiple documents without the need to fold them. Documents with more than 75 pages are automatically updated to Certified Parcel. Users will see this indicated along with the price at checkout.
What is the cost of sending Flat Mail?
The cost for sending Flat Mail starts at $2.67 each for First-Class Mail and $9.96 each for Certified Mail (without signature receipt). Prices may vary based on additional features or options selected.
Can I track my Flat Mail?
Yes, you can track your Flat Mail if you choose Certified Mail. Tracking information will be available in your LetterStream account, and you can also track it on the USPS website.
What types of documents can I send using Flat Mail?
You can send a variety of documents using Flat Mail, including contracts, presentations, reports, and any other important paperwork that needs to remain unfolded.
Do I need to supply an address list for Flat Mail?
Yes, you will need to provide a CSV data file or address list when creating your Flat Mail job. This ensures that your documents are sent to the correct recipients.
