The suitcase benefits hugely from its ABS+PC hard plastic shell. it goes through insanely strict quality control test standards, creating strong and sturdy pieces that can withstand any forms of rough handling.Please note this luggage is sold separately, but If you intend to buy two or three suitcases, the small suitcase can be stored inside the bigger one With built-In TSA lock, you can make sure your valuables are secure and safe. Quiet airplane spinner wheels and an adjustable 3-level 100%pure aluminum telescoping handle allow you to quickly maneuver in tight spaces and it’s sturdier than most of the telescoping handle on the market. Make packing clothes easy with the fully lined interior and the multi-use organizational pockets. Three different size: Size: 20inch (21 x 8.5 x 15), 24innch (17 x 10 x 24.5) 28inch (20.5 x 11x 29), Please note that ONLY 28in is Expandable, adding 15%to the scalable space.