The 9 x 12 Catalog envelope has a width of 9 inches and a height of 12 inches, giving it a total surface area of 108 square inches. Its maximum enclosure size is 8.75 x 11.75 inches. This catalog envelope is sometimes referred to as the 9 x 12 booklet envelope, due to its dimensions.
Catalog envelopes like the 9 x 12 get their sizing from the width and height in inches rather than a numbering system. With an open end and center seam, the 9 x 12 catalog allows flat insertion of documents without folding. Its ample width and height provide room for larger products like magazines, posters, documents and items needing protected mailing. The open end prevents creasing and damage. The 9 x 12 serves an efficient niche for enveloping big, flat pieces. Its size makes it one of the most popular options for mailing flat catalogs, brochures and documents.