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"The strength of a corrugated box starts with its material. A box’s strength is relative to its density. The more walls a box has, the stronger it will be. The manufacturer's stamp inside the box usually states single wall, double wall, or triple wall to let you know the strength of the box. This stamp also states that the box meets or exceeds the U.S. Department of Transportation's criteria. Use a single wall box when the contents weigh less than 65 lbs for multiple items. If you are packaging heavy items, a regularly-sized single wall box can hold about 45 lbs total.
Depending on the size of the box, a single wall corrugated box can hold between 20 lbs and 120 lbs, a double wall corrugated box can hold between 80 lbs and 180 lbs, and a triple wall corrugated box can hold between 240 lbs and 300 lbs. The maximum gross weight limit is printed on the box maker's certificate on the bottom flap of most boxes.
According to the
Oak Ridge National Laboratory , the outside of the corrugated box must have a water absorption rate not higher than 155 grams per square meter, tested over a thirty minute period. Finished boxes should also be free of ragged edges, loose or protruding stitching, dirt, or oil stains. Typically the corrugated medium is just under 0.03 pounds per square foot. Linerboard constitutes the bulk of the bursting strength of a corrugated sheet. In regards to shipping a box, it is always weighed with its contents. Most shipping companies have guidelines as far as the size of the box and the weight of its contents. Purchasing a corrugated box is six percent of the total purchase of the item, including any potential delivering or shipping fees."