Proper closure of your package is as important as adequate cushioning.
To close a box securely, use a strong tape - two inches or more in width - such as the types described below.
Pressure-sensitive plastic. Generally, the easiest, most convenient tape to use. It is versatile because it will adhere without water, and can stick to a variety of surfaces and shapes. Nylon reinforced variety is also available. Water-activated paper tape. Use 60-pound grade tape at least three inches wide. Apply three strips to both the top and bottom of the box, as shown in the illustration. Water-activated reinforced tape. Similar to plain paper tape, except that reinforcing fibers have been added for strength. Reinforced tape's advantage is that you only need to use two center seam strips, in contrast to the six strips shown in the illustration for paper tape. Do not use masking tape or cellophane tape. (These tapes do not provide the strength necessary for secure closures.) Do not use string or paper over wrap since they may snag on automated equipment, resulting in lost address information or package contents.