Abstract: A partition divider is formed from a cut and scored blank of flat sheet material such as paperboard or the like and comprises a flat blank having at least one partition divider erectable from the plane of the blank. The divider is comprised of a partition member and a partition position maintaining member defined by cut lines and a common, continuous hinge line in the material of the flat blank. The partition member is rotatable out of the plane of the blank along the hinge line through an angle of 90% approximately to an erected position, and the partition position maintaining member is rotatable independently of the partition member in the same direction out of the plane of the blank along the common hinge line through an angle of approximately 180.degree. and into an opening resulting from the rotation of the partition member thereby maintaining the erected position of the partition member.