Illustrated envelopes were one of many advertising methods used to promote the 1885 World's Industrial and Cotton Centennial Exposition. Requests for information, received by the exposition’s management and the numerous state commissioners, were promptly replied to and mailed-out using various sizes and styles of official envelopes. One official envelope featured detailed line-drawings showing three of the exposition's major structures: the Main Building, Government Building, and Horticultural Hall. The reverse side contained printed information, which gave a detailed description of the upcoming exposition. Similar envelopes were also used the following season, to promote the North, Central and South American Exposition. This form of advertising was both inexpensive and effective, due to the many hands the envelope passed through before reaching its destination. Below are two images of this unique method of advertising: 
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