Direct mail packages usually involve some pretty nice quantities, but I think more and more companies will look to digital printing in the future. Select stock carefully, letting the application dictate the choice. For many applications, a main concern is that the contents don't show through the envelope. The image the client wants to portray also influences stock selection. Make sure all components fit well in the envelope.
Many envelopes contain several pieces.
A billing envelope may include a letter, statement and promotion. Direct mail envelopes often include cover letters, brochures, plastic cards, return envelopes and more. Test samples on automatic inserting equipment. Consider envelopes for applications that previously used boxes or cartons. There are a variety of flexible protective envelopes available.