IN 10th CENTURY:
Several times ago, Early people had no facility to carry luggage so at that time animal carried their luggage from place to another. Animal carried the heavy load.Some animals died due to heavy load.
Some people also travel and enjoy on animals. Children enjoy a lot of animals.
IN 21st CENTURY:
Now-a-days, The time has changed. People are doing many things to do work easy. They save time and money. Today there are many facilities to carry luggage from one place to another but nowadays some rural area uses the animal for carrying luggage. they made trucks, container, and many others. My opinion, we shouldn't use the animal for carrying a heavy load on it.
The system keeps on changing but as you said people keeps using animals to carry load...nice post
yes, my friend in the rural areas there is an unmetalled road so that why they use animals for carrying luggage.