A flexible, uniform mail package for use with automated mailing procedures and a method of distributing advertising and promotional items. A mail package includes a plastic tray with at least one well for containing and securing an article, such as a pen or a key tag, within the mail package. The mail package meets current and proposed USPS uniformity and flexibility standards for automated handling of the mail packages, and is capable of being processed, without issue, using automatic equipment thereby reducing postage costs compared to non-flat machinable mail pieces.