In this mobile world, everyone is moving very fast in their daily routine life. They need to travel from places to places. Their purpose of visit may be official or personal. If we move for an official work the amount of luggage we are going to carry will be less and a carry bags is enough for them to get all the things packed up because official works will take only one or two days only to finish our work.
On the other hand if we visit for personal use, mostly we will go to meet our relatives and friends or we might go on a jolly tour and at that time we might be going out of station for a week, on that time the amount of things we need to pack might be larger and larger carry-on might be needed. If we go on for a family tour, the size of luggage will vary. We must buy the best and cheaper ones since bags aren't a separate part from our life.