I included a piece of paper with my address and request ID and the address of the person I was mailing to. Since the book was over a lb. it had to be handed over at the desk. They ask if anything was in it with the book as it could be opened and checked, so I told them about the piece of paper. They wanted to charge about $5.00 more then the $2.93 Media Mail for this piece of paper. I've mailed one other book over a lb. and that tme there was no problem. I had to bring it back home,open it up and remove the paper, and retape the envelope mailer. So I can only hope my ID request will be credited to me. So the idea of putting ID request as suggested by PaperBackSwap is not a good one I guess. 

Sounds like your PO is uninformed. Unless I'm mistaken that piece of paper is considered an invoice which is allowed via media mail. I wrap all my book with 3 sheets of paper; 2 on the outside and one (the invoice) folded inside the book. Never had a problem. I have also received many books with the PBS invoice tucked inside with no problem. Hope you can educate them.

Pam

When they ask that question you say just the packing slip (or invoice). Those are allowed with media mail. If they say it is not allowed in media mail tell them to look up the regs on incidental items allowed.

Yuppers, packing slips/invoices are allowed in media mail...personal notes are not.

A personal note is allowed to be included in Media Mail if you will pay the cost of a postage stamp over and above the Media Mail postage.
 It is known as an "Enclosure"  Not all postal clerks may be aware of it though.

Interesting Anita, thanks!

And the "break point" where you need to bring the package to the PO when using stamps is 13 ounces, not 1 lb.

Here's the information from the Help Center, along w/ the USPS regulation link.  You might want to print it out and bring it with you next time you go.

An invoice or notification of the shipment

• The second page of the PBS Wrapper falls into this category.
• The USPS eligibility guidelines for enclosures and attachments for Media Mail say (we have edited these for relevance; the full regulations are at http://pe.usps.com/text/dmm300/173.htm#wp1060522)