What's the best way to mail..
This is found on the USPS.com website, the envelopes are prepaid in packaging of 5 per. They are the heavier cardboard(paper) so will not bend or fold as easy as say a manilla envelope will.
"The Postal Service has issued a new, prepaid version of the Priority Mail Flat Rate envelope featuring the $3.85 Jefferson Memorial stamp image printed directly on the envelope along with the traditional Priority Mail graphics. Because the Flat Rate is a predetermined rate regardless of the weight or destinating zone of the item being mailed, customers receive one price for delivery anywhere in the U.S., regardless of what their item weighs. The prepaid version of the envelope seeks to further customer convenience by saving time and enabling an even more simplified transaction."
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