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Courier pricing is a first-kilogram rate plus a lower marginal rate per additional kilogram, which is why average cost per kilogram falls sharply with shipment size. Consolidating several small parcels into one is usually much cheaper than sending them separately.
Courier cost
cost = first kg rate + (weight - 1) x additional rate + surcharges
It carries the fixed cost of collection, sortation and delivery, which is largely independent of weight. Marginal kilograms only add line-haul cost.
Residential delivery, remote area, fuel, oversize, and address correction. They can easily add 20-30% to a headline rate.