There are two main envelope standard systems we're going to review. The main flap shapes are shown in the illustration. The flap is the part of the envelope that is folded to seal the envelope. Such envelopes are ideal for automatic insertion applications. Those with the flap on the short dimension are called Open Side envelopes. The envelopes with the opening and seal flap located on the short dimension are called Open End envelopes. The variations of these parts create different envelope styles. This picture illustrates various parts of an envelope. Below describes the most important types of envelopes used in the United States. International envelope standards may differ. There are plenty of envelope types and sizes available - they differ by size, flap type, may have windows.
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