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MailStream Plus - What are the max dimensions for BPM Flat mail pieces


 
The Physical Standards in the DMM for Bound Print Matter Flat requirements are in the section 200 Commercial Letters, Flats, and Parcels Design Standards
201 Physical Standards Web site address for above information:

https://pe.usps.com/text/dmm300/201.htm#ep1097220
UPDATED:  September 15, 2017