Made of solid ABS+PP material. After professional and strict load-bearing test. The case is strong enough. The maximum load capacity of 21" Carry-On, 26" suitcase, 30" suitcase is: 33lbs, 44lbs,55lbs
The 3 pieces set includes 21 inches, 26 inches and 30 inches, separately weighing 6 LBS, 8 LBS and 9 LBS. One set just satisfies all your different travelling needs
Expandable function, effectively increase the width of the suitcase, allowing you to put more luggage when you travel
The hard shell expandable suitcase set are designed with two sturdy carrying handles, which make them easy to carry up and down the stairs