There is no exception that when people are on a long tour they tend to keep a lot of bags and luggage with all the necessary things or necessities with them. It is because they are afraid of the situations when they need something and there is no way to get it instantly in a place where you just have arrived. It also depends on the length of your flight and the number of destinations you are going to visit during the tour. You may want to keep each and everything that you may need while in any country or region so that you can stay worry free and enjoy more.
But due to the fact that you will have to manage your luggage and it could be very hectic if you take all things along with you. Like if you are travelling from Australia to Europe, you may think you will have to book cheap flights to London or cheap flights to Paris and you might think you will need warm clothes with you. After that if you have booked flights to Bali or cheap flights to Los Angeles and cheap flights to Singapore then you may think you will be needing some summer clothes or cotton clothes with you to make sure you will be easier there even if there is an extreme difference in the temperature levels.
But not all of the people tend to travel that way. Some people need to stay active and take a few things along while they travel. The best thing they do is to keep their luggage short and maybe just one handbag and they keep some money to buy necessary things when needed. It is possible when you are travelling alone and have no kids or tots with you.
If you want to travel without a lot of luggage and carrying a single handbag, then yes its possible to do so in case the cities or destination you are going to visit have no such temperature differences, like if you have booked cheap flights to Hong Kong and also flights to Beijing as well as cheap flights to Bangkok and cheap flights to Tokyo you can see all these destinations may not have any climatic difference and you can take a few things in your handbag and just take off for your tour.
But if you have got to travel from America through cheap flights to Shanghai or to China, then you surely will need a few more things to take along.