What are the introductions of various materials of the trolley case?

There are three important considerations when buying a trolley case: zippers, trolleys, and rollers.

The specific introduction of the trolley case:
The material of the rod is usually aluminum alloy, and the structure has one type, two-piece type, and three-section type. Two-piece type, three-section type, it is a pointing stick, and the length can be adjusted according to the weight of the body. When choosing and buying, you can decide according to the actual situation or your own preferences. In addition, other configurations of the trolley box, such as whether the button setting is humanized, whether the trolley is smooth when pulling, and so on.

Generally, the rubber roller material is resistant to abrasion, impact and low noise. It has a built-in one and an external one. In addition, rolling rollers in any direction are usually called "universal wheels". The advantage of the "universal wheel" is an important part of the trolley case. The operating body can freely change its direction and move, but its disadvantage is that it cannot be easily loaded and unloaded during inspection. For the sake of safety, when choosing a roll, do not choose the direction that can be arbitrarily chosen, but choose safer.

The timeliness of the zipper pull is stable and there is no noise, which is an important indicator to consider. But the zipper with louder sound usually gives people the feeling of more safety.
The size of the trolley case you buy depends on the number of clothes you have. Of course, you have to do it on a flat surface. It depends on personal regulations.

The common sizes of trolley cases (here referred to as the “length” or “height” of the trolley case) are 18 inches, 20 inches, 22 inches, 24 inches, 28 inches, 30 inches, etc. Due to imported trolley cases, here “inches”, Refers to "inches." 1 inch = 2.54 cm, 18 inches = 18 * 2.54 cm = 45.72 cm.
Under normal circumstances, a trolley case of about 20 inches is sufficient.