I just encountered a strange thing when scheduling an LTL shipment online. An unrelated density calculator had given a result of 20.3 pounds per cubic foot. When I initially entered the data into the shipping system, it gave the same result but then later it changed to 7.69. Apparently it was the delayed result of my checking the non-stackable box. After talking with the broker, I found out the LTL industry has decided to consider anything non-stackable as 96 inches tall so no matter what you put in for height, they replace it with 96 inches. These means something you had been getting shipped as class 60 may now be rerated to class 250 or worse. This would dramatically increase the cost of shipping.
