Priority Mail Express Padded Flat Rate Envelope | USPS.com
If I'm shipping a package with a Mercari USPS Priority mail label is it ok to use this padded envelope? I've seen lots of things about them only accepting certain types of
ReadyPost Bubble Mailers | 12-1/2 x 19-inches | USPS.com
Hot Tip: Shipping Boxes Sized to Fit in Flat Rate Padded Envelopes - Stamps.com Blog
can i use this priority mail envelope for this depop package? i ordered a bunch of these and never used them and i know theres strict rules with them. : r/Depop