I do a lot of selling on EBAY, if your item qualifies for the special “Ebay Envelope” rate it is a great way to save on shipping, and the best part is it includes Tracking.
I sell baseball cards, post cards and other items that qualify, having the tracking included is very valuable.
2 to 5 business days Max. 13 ounces, 15 by 12 by 1 inches
And it came back with the $2.05.
If I go onto usps.com, max thickness is 1/4", and then you jump to a package rate which starts around $5. :-(
Agreed about the tracking. And of note, I have received items in envelopes from US eBay sellers that sound like what you describe, even exceeding the 1" thickness maximum I ran into.
Can I find somehow, literally, "eBay envelope" ? I simply don't see it in the many options under "Select a shipping service". ???