German bayer makronlon material & three-layer composite pressure-resistant structure makes the surface more wear-resistant to reduce the traces of collisions.Surface honeycomb design for better protection against scratches, Thickened aluminum alloy four-stageheight adjustable ergonomic rod to adapt to different user heights. Shaking Range within 1.5cm, 5 fully zipper pockets & a separate storage bag, 4 spinner whell with easy 360-degree maneuverability. Feature with high resilience TPE material to absor shock and reduce noise, Zipper closure with side mounted TSA lock