04/28/2021
One of the most frustrating parts of the postal system is trying to understand the direct mail regulations as outlined in the DMM (Direct Mail Manual). An excerpt is found here:
3.3.9 Product Samples and Periodicals
Subject to the requirements in 3.3.1 and 3.5.4, product samples related to print advertising in the issue and are not offered for sale within the meaning of 3.4.2a and 3.4.3 may be included in a Periodicals publication as a page, or part of a multilayer page. Examples include, but are not limited to, a swatch of cloth; a paper towel as part of a printed page, or printed paper towel; a bandage; and fragrance, cosmetics, lotions, or edibles in packet form.
This is a manual for an attorney, not the average person. Still, the system is bound by these rules and regulations, many of which can be interpreted several ways.
That's why it is important to speak with a professional mailer like Do-Good.biz (612-789-7226) or the post office itself whenever you are organizing a large mail project.