Above 60 kg, this stops being a courier parcel.
Above 60 kg, a lot travels as air freight, not a courier parcel. The price depends on the destination and the quantity, so it is worked out by hand rather than shown on a page.
Tell Ahmed the destination, the kilos and the timing below. He answers himself within one working day and sends one fixed-price checkout link built for that quantity and destination. If freight cannot be made to work for that destination at that quantity, he says so and names the largest lot that does.