The USPS will be implementing deflection standards for Flat size mail in order to maintain product integrity and to improve production efficiencies with postal automation equipment. The rule will be implemented on June 7, 2010. The changes to these mailing standards will apply to all flats, not just automation flats. 

Example:

• The longest edge of the mail piece is considered its length.

 
• Oblong pieces (bound on the shortest edge) are also subject to deflection standards.

Mail Pieces w/ Length 10” or Greater 

1. Place the piece on a flat surface with the length perpendicular to the edge of the surface and extend the piece 5 inches off the edge of the surface. Test square-shaped bound flats by placing the bound edge parallel to the edge. Repeat on opposite edge.

 
2. The piece is mailable as a flat if it does not droop more than 3 inches vertically at either end.
   

Mail Pieces w/ Length Less than 10”

1. Place the piece on a flat surface with the length perpendicular to the edge of the surface and extend the piece one-half of its length off the edge of the surface. Test square-shaped bound flats by placing the bound edge parallel to the edge. Turn the piece around and repeat the process.

 
2. The piece is mailable as a flat if it does not droop more than 2 inches less than the extended length from both ends. For example, a piece 8 inches long would extend 4 inches horizontally off a flat surface. It must not droop more than 2 inches vertically at either end.

 Please contact Ben Madril, National Director of Mailing Operations at 562.794.2467 with any questions.