The Postal Service is implementing the Flats Sequencing System to fully automate the processing and delivery sequencing of flat-size mail. FSS can sort flats into delivery sequence, increasing efficiency by reducing carriers’ time manually sorting mail and allowing them to begin delivering mail earlier in the day.

Standardized addressing benefits the overall flats mailstream – from efficient processing to delivery. The new requirements will go into effective March 29.

More information is at ribbs.usps.gov, Flats Sequencing Strategy. This includes updated Addressing Fact Sheets for each class of mail. Click Flats Addressing Requirements and scroll to the bottom of the page.

Mailers needing guidance on specific mailpiece designs are encouraged to work with their local mailpiece design analyst (MDA). To locate the MDA near you, go to pe.usps.com and click Postal Locator, then Mailpiece Design Analyst.