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Priority mail supplies have always been free. In my poorer days I found all kinds of non-postal uses for those supplies (somewhere on the interwebs you can find a guy who constructed a whole apartment full of furniture out of free priority mail boxes).
Of course, if you use them you have to send the item at the priority mail rate.
However, if a tyvek envelope is good enough for you this can be a good thing because you just turn the envelope inside out before using it.
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