Folders and Booklets
What size should a folder be? This will depend upon how much material must go into it, how the paper will cut, and what kind of envelope is to be used. A popular size for larger programs is 6 by 9 inches, which requires an outsize envelope for mailing. Another popular size is 41/2 by 6 inches, which also requires a special envelope unless it is self-mailed. Probably the most extensively used size is 4 by 9 inches, which will fit into a business envelope, Another common size is 3‘/2 by 6‘/; inches, which will fit into a correspondence envelope.