A blank sheet of foldable material having a plurality of laterally spaced parallel fold lines dividing the sheet into six consecutive panels to allow for folding of the panels into overlapping engagement. A first leg formed from overlapping panels two, three and six. A second leg intersecting the first leg formed from overlapping panels one, four, and five. An adhesive placed between panels two and three, panels one and four, panels one and five, and panels two and six for securing the panels together to maintain the legs in a fixed folded arrangement with each other.