Shipping costs are calculated based on the actual weight of the parcel, except in the case of oversized parcels.
In this case the delivery cost is calculated based on the dimensional weight. A parcel is considered oversized
if the sum of its three dimensions exceeds 150 cm, and its dimensional weight is at least twice the actual weight.
In such cases the shipping cost is based on the dimensional weight of the parcel
(length (cm) x width (cm) x height (cm)/5000), with a special reduced rate applied.