What is the size of the flap on a #9 Remittance Envelope?

The flap on a #9 remittance envelope measures 3 5/8 x 8 7/8 inches (3.625 x 8.875). The back flap is 1/4 inch shorter than the front of the envelope and is attached so it folds over for writing and sealing.

• Envelope final size: 3 7/8 x 8 7/8 inches.
• The long flap is ideal for donor information and reply instructions.
• It fits inside a #10 as a reply envelope.