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A hard-side upright luggage is made of tough materials to ensure a strong and firm exterior. It protects the inside clothing or other items to a maximum extent. Unless you smash a brick on its shell, it stands most force and is not likely to be worn out.
1. Material
In the hard-side upright luggage market, polypropylene and ABS shell are the most commonly used materials. Both of them provide durability and lightness at the same time.
Aluminum shell, widely used in laptops, can also be found in the making of hard-side upright. But it is not a wise choice, because it fails in lightness.
