Envelope Sheet Capacity

Standard Sized Envelopes (outer #10 envelopes)

We can fit up to 15 sheets of 8.5x11 20lb paper into a standard #10 envelope, or up to 75 sheets of paper into our large Flat sized envelopes.

If you need to include legal sized paper, we can include up to 55 sheets of legal sized paper into our large Flat sized envelopes). If you need to include more than the envelope capacity allows, we recommend using the "duplex" printing option (back-to-back printing), as this will allow you to attach a 150 page PDF document and only 75 sheets of paper will be needed.

On the "Create A New Job" screen, under the mail type section, the USPS Flat option will automatically place your documents inside a large flat envelope.  If you don't choose the flat option and then end up exceeding the 75 page limit our system will automatically convert your job to a flat mailing for you.

The 75 sheet limit is a hard limit for Certified mail due to USPS weight limits. But if you are sending documents via First-Class mail our system will allow more than this. Any sheet count higher than 75 sheets of paper for First-Class will be automatically upgraded to a box shipment mailing. Nothing will change for you, the only difference is that your documents will be sent in a box rather than an envelope.

Maximum sheet count (summary):

First class mail - no maximum sheet count

Certified mail - 75 sheets (up to 150 duplex pages)

Registered mail - 15 sheets (up to 30 duplex pages)