Why does the shipping weight state 30 lbs. or 70 lbs. when the item weighs less than that?
Most major shipping carriers base their shipping rates on both the size and weight of the package, using a dimensional weight formula (typically, length x width x height divided by a dimensional weight divisor). If the dimensional weight exceeds the actual weight, the shipping cost is determined using the dimensional weight.
Additional surcharges may also be applied on packages that exceed other size limits as specified by the carrier.
More information on dimensional weights and other charges can be found using the links below
UPS Dimensional Weight
FedEx Service Guide
USPS Dimensional Weight
Last Updated: 11/30/2018