First, we can observe the advantages and disadvantages of the two methods. Europeans and Americans like to carry big bags, which can help them free their hands and make it especially convenient for them to hike in the deep mountains and wild forests. Imagine what it would be like to pull a suitcase in that environment.
Let's talk about suitcases that people in China like first. Its main purpose is to reduce the burden. Although the weight will be reduced after traveling, it is still very heavy for girls, so the suitcase can hold a lot of things well without hindering the progress. Usually, China people will take their luggage to their destination and put it in hotels before going into battle lightly.
Considering the above advantages and disadvantages, it is a superficial reason. From a deeper analysis, it is caused by the cultural differences between the two places. Cultural differences in different places will subtly affect the behavior and habits of local people. As we all know, Europeans and Americans like to travel freely and deeply. This concept and way of traveling leads them to carry big bags when they go out, which is a long-standing thing, so it is nothing strange.
The above is my answer to this question. Although I can't satisfy everyone's ideas, it is also reasonable. Please forgive me if it doesn't agree with your idea.