[7-12-26] EDDM-Retail flats must be separated by delivery route (or Post Office Box section) under 145, using delivery statistics obtained from the EDDM online tool at the website https://www.usps.com/business/every-door-direct-mail.htm. Retail flats must be in bundles of 50 – 100. Place a facing slip on the top of each bundle, under the straps, with the number of pieces in the bundle written on the facing slip. See 203.4.0 and 602.3.2.3 for more information.