A storage box for a garment such as a graduation gown or keepsake item or other item requiring safe and long-lasting storage is fabricated in one rectangular piece. The storage box in its expanded state may be shipped as a flat rectangular piece approximately 20-40 centimeters wide by 60 to 100 centimeters long. Triangular folding corners join first and second collapsible sides respectively to a binding panel and to an inner folding side panel. An outer folding side panel locks the triangular folding corners joining the respective collapsible side panels with the inner folding side panel to form an inner compartment for receiving a garment for storage. Magnets may be embedded in a magnetic closure panel and at least one folding side panel of corresponding size, shape and location to lock the storage box.
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