Here are the facts for bound printed matter from teh USPS. Keep in mind, it's not always less than media (or even first class if light) and I believe it's not forwarded or returned if not deliverable. Is that correct CAnn? I was also told by the Karner Rd Faciltiy (which is where I assume your found out you could use it), that you can not have any personal stationary in it, such as an invoice or note from eBay or yourself..no notes at all.
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Bound Printed Matter
Description
The maximum weight for Bound Printed Matter is 15 pounds. Rates are based on weight, shape, and distance. The maximum size is 108 inches in combined length and distance around the thickest part.
Mark each package "Bound Printed Matter" in the postage area.
Bound Printed Matter must:
a. Consist of advertising, promotional, directory, or editorial material (or any combination of such material).
b. Be securely bound by permanent fastenings such as staples, spiral binding, glue, or stitching. Looseleaf binders and similar fastenings are not considered permanent.
c. Consist of sheets of which at least 90% are imprinted by any process other than handwriting or typewriting with words, letters, characters, figures, or images (or any combination of them).
d. Not have the nature of personal correspondence.
e. Not be stationery, such as pads of blank printed forms.