Usps Priority Express Envelope. There are also more rate and package options, including several Flat Rate box and envelope sizes, Regional Rate, weight-based rates, and dimensional-based rates. The outside of the envelope will bear the Priority Mail Express Flat Rate service printed on the surface.
The Postal Service will even deliver the supplies to your door for free.
Your direct mail package needs to be different from others to cut thru the Express Letter and Priority Mail "look and feel".
There are also more rate and package options, including several Flat Rate box and envelope sizes, Regional Rate, weight-based rates, and dimensional-based rates. Select the Standard Services option to 'Retrieve Standard Service rates from the USPS API'. The Padded Envelope is flexible enough to include a small box inside to protect your items Order USPS Supplies in Bulk!