Envelope Terminology Envelope Construction This diagram illustrates the various parts of an envelope. Variations on these parts create the various envelope styles. Dimensions and Designations Sizes are listed in inches, the shortest dimension first. Designations depend, in part, on the location of the opening and the seal flap. It is important to specify how the envelope should open for aesthetic reasons as well as for functional considerations. Open End   This is an Open End (OE) envelope. The opening and seal flap are located on the short dimension. Open End envelopes are well-suited to hand insertion applications. Larger, Open End envelopes are also called "Catalogs". Open Side This is an Open Side (OS) envelope. The opening and the seal flap are located on the long dimension. Open Side envelopes are ideal for automatic insertion applications and are suited for hand insertion applications as well. Larger, Open Side envelopes are also called "Booklets" BACK | NEXT   TABLE of CONTENTS

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