A flat envelope is 9" wide and 12" high and dual windowed. The certified flat is a single windowed envelope. Pages are not folded before being inserted into a flat envelope.
What is a flat envelope?
or drag and drop files
A flat envelope is 9" wide and 12" high and dual windowed. The certified flat is a single windowed envelope. Pages are not folded before being inserted into a flat envelope.
Carly Brown
Comments