Ideal for moving, shipping, and storage of fragile items, heavy-duty corrugated boxes are made to be durable, and an economical choice, as well as to provide maximum protection from internal damage. This type of box can be purchased in single or double wall to resist tearing, splitting, or bursting. All of our heavy duty boxes are 44 ECT and are approximately 35% stronger than standard boxes. All our heavy-duty boxes are 100% recyclable and available in different sizes and shapes — best for shipping exercise equipment, electronics equipment, machine parts, automotive parts, and much more.