![]() The most well known commercial envelope is No.10, as it is able to fit Letter size paper folded three times, or Legal size paper folded four times parallel to the shorter side.Īlso known as A series envelopes, most commonly used for greeting cards, invitations and photographs. ![]() They are long and thin, with an aspect ratio of between 1:1.6 and 1:2.2. For example, A2 becomes A-2.Īlso referred to as Office envelopes, are most commonly used in business situations as they are suitable for automated franking and filling. To identify the difference between a ISO size and the US size, a hyphen is often inserted between the letter and number. Other less known styles of envelope are Baronial, Booklet and Square. ![]() They are known as Commercial, Announcement and Catalog. There are three main types of envelopes used in the US and they do not correspond to the ISO standard of paper sizes.
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