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
Office Depot
ReadyPost Bubble Packing Material | USPS.com
How to Save a TON of Money by using the Padded Flat Rate USPS Priority Mail Envelope. - YouTube
PSA: How to safely and discreetly send bullion : r/Silverbugs