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For Pieces 10 Inches or Longer

1. Place the piece on a flat, straight-edge 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.

2. Place a flat 12-inch ruler (or other similar flat object 12 inches or longer) on top of the mailpiece with the length parallel to the edge of the surface and as close to the edge as possible so that the 5-pound weight does not extend past the edge.

3. Place a certified 5-pound weight on the center of the ruler to hold the piece in place.

4. Determine the vertical deflection in inches.

5. Turn the piece around 180 degrees and repeat the process.

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