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
Priority Mail Express Flat Rate Legal Size Envelope 15" x 9 1/2" – Endicia Supplies Store
Hot Tip: Shipping Boxes Sized to Fit in Flat Rate Padded Envelopes - Stamps.com Blog
How much should I pay for postage to ship out my orders? – TCGplayer.com
Did USPS Discontinue Priority Mail Flat Rate Padded Envelopes?