Can you put CDs in there that aren't "From the publisher"? I'm thinking not for some reason... any idea? It's an audible.com download.

I have.........all kinda of audio, tapes, cd and burned cds but I was nervous about it. There are 2 types of M-Bag rates, one slightly cheaper. The way I understand it is that cheaper rate is for paper products only.

"Mailers who enter other types of qualifying printed matter, or printed matter in combination with allowable merchandise items, are required to pay the "regular" M-bag postage rates."

Qualifying matter = Articles of merchandise may be enclosed in M-bags, provided that all of the following conditions of mailing are met:

a. The merchandise items being sent are limited to disks, tapes, and cassettes; commercial samples shipped by manufacturers and distributors; or other non-dutiable commercial articles or informational materials that are not subject to resale.

So, yeah, you can put all kinds of audio in but if you are totally honest about it, should have to pay the higher rate. I lied my ass off and paid the cheaper on but what if it gets opened and checked? The receiver may have to pay up - I don't know for sure.