Abstract: A one-piece rectangular box having double reinforced corners at opposite ends thereof is formed from a single rectangular sheet of material having opposite end portions provided with sections which are doubled and folded inward and secured in overlying relation with respect to the central base portion of the sheet. The double portions extend upward from the inwardly folded sections to form reinforced end walls of the box. Side portions of the sheet extend upward from the base portions to hold the ends and sides of the box in place eliminating the need for dunnage or packing and cushioning means for protecting corners of the box and its contents.