Informing the buyer about the reduction of the weight of the bag

Q 2: A person imports materials from abroad which arrive in closed packs. These packs have a fixed weight of 50 kilograms. However, by the time these packs are sold the weight decreases to 49 kilogram due to weather conditions without interference on the part of the seller who sells the packs as 50 kilogram each. What is the ruling in this regard?

A: If he informs the purchaser, there is no blame for him, but if not, this becomes cheating on the part of the seller and it is Haram (Prohibited). May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.