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
What Priority Mail Flat Rate® Envelopes Are Available?
USPS Priority Mail Flat Rate: What You Need to Know | Shipping School
Priority Mail Flat Rate Padded Envelope 12 1/2" x 9 1/2", 10/pack – ONYX Products®
USPS Priority Mail Flat Rate®, Flat Rate Boxes - Stamps.com
What Priority Mail Flat Rate® Envelopes Are Available?
Priority Mail padded flat rate USPS envelopes with USA sticker (Pack Of 5) ⭐T1⭐ | eBay
Let's talk about padded flat rate envelopes. I love them. What kind of things have you fit in them? Do you risk a small chance of damage for a large savings? Did