A packaging container for a load having a projection such as a nailing fin is made from two rigid U-boards. An inner U-board supports the weight of the window/door frame while preventing the nailing fin from having contact, directly or indirectly, with the ground or sides of the fin crate. The nailing fin provides one supporting wall for the inner U-board while a second, outer U-board provides a second supporting wall. Both walls prevent the inner U-board from spreading out or collapsing under the weight of the window/door. The inner U-board is formed as a continuous element or as discrete elements. The nailing fin is incorporated into the fin crate to form a support member and part of the packaging container.