Proper closure of your container is just as important as proper cushioning for the safety and security of your shipment. To close a box securely, do not use masking tape, cellophane tape, duct tape, string, or paper over-wrap. Instead, use a strong tape -- two inches (five cm) or more in width -- such as these types: Pressure-sensitive plastic or nylon-reinforced tape Generally the easiest, most convenient tape to use Versatile because it adheres without water and sticks to a variety of surfaces and shapes Apply three strips to both the top and bottom of the box Water-activated reinforced tape Use 60 lb (27 kg) grade tape at least three inches (eight cm) wide Requires only two center-seam strips of tape for both the top and bottom of the box, due to the reinforcing fibers