Abstract: The packing end cap includes a collar defining an interior cavity into which an item to be packaged may extend. The collar is comprised of longitudinal leg members interconnected at opposite ends by lateral leg members. An expansion joint is integrated within each lateral and longitudinal leg member. A plurality of blocks can also be disposed within the interior cavity hinged across an interior edge of a lateral member. Each block can pivot about the interior edge, enabling it to be positionable in a first position substantially parallel to a plane defined by the collar, and a second position perpendicular to the plane.