How to ship padded envelopes via First Class USPS
community.ebay.com › t5 › ShippingJan 01, 2019 · Just call it a package and enter "1" as the thickness. Weight is measured in full ounces, and any fraction would round up (e.g., 2.1 ounces ships at the 3-ounce rate). To make sure that it qualifies to be mailed as a package rather than as a letter or flat (AKA Large envelope), it must be either (1) over 3/4 inch thick or (2) over 1/4 inch ...
Postage Rates & Prices | USPS
www.usps.com › business › pricesPrices. Priority Mail Express ®. From $27.25 at the Post Office ™. From $23.75 for Commercial Base ®. From $23.75 for Commercial Plus ®. Priority Mail Express Flat Rate Envelope. $27.90 at the Post Office. $24.25 for Commercial Base. $24.25 for Commercial Plus.