Quarter-folded booklets are mailpieces that are bound and then folded to letter-size. The folded spine may be the leading edge or at the top of the booklet. If necessary, the booklet may have the spine as the trailing edge — however, the Postal Service does not recommend this configuration. The cover must be at least 40-pound book-grade paper. Folded booklets must be sealed with nonperforated 1.5" tabs.
Quarter-folded booklets have the following characteristics:
See Exhibit 4-9 for various types of quarter-folded booklets and further descriptions.
Exhibit 4-9
Quarter-folded Booklets
Type
Description
Vertical Spine
Minimum 40-pound book-grade paper.
Place two 1.5" nonperforated tabs on leading edge and one tab on trailing edge. Place upper tabs 1" from the top edge. Place lower leading tab 0.5" from the bottom edge.
Horizontal Spine
Up to 9" long: 50-pound book-grade paper.
Over 9" up to 10.5" long: 60-pound book-grade paper.
Tabs: Booklets up to 2 ounces must be sealed with 1.5" nonperforated tabs; booklets over 2 ounces must be sealed with 2" nonperforated tabs.
Spine at top on address-side panel.
Place one tab on the leading and trailing edge 1" from the top; place one tab on the lower leading edge 0.5" from the bottom.
