In the case of bigger sized shipments carriers will charge the volumetric weight if it exceeds the actual weight (actual weight is the normal measurement you get from a scale). A big box of feathers may only be a few kilos but still has a higher shipping fee because of its size, this is because it has a higher volumetric weight.
The calculation for volumetric weight (for carrier shipments) is the following:
Length (cm) x width (cm) x height (cm) / 5000
Example: a box that is 100cm long, 60cm wide and 40cm high has a volumetric weight of 48kg.
If your shipment’s volumetric weight is higher than its actual weight, then please provide the volumetric weight.