Polycarbonate hard side shell, Four 360 degrees spinning wheels system 
Retractable handle, Built-in 3-digit combination lock, Interior zipper divider, accessory pocket and tie-down straps 
20" Carry-On Dimensions: 20" H x 13" L x 9" W - 6 lb 
24" Upright Dimensions: 24" H x 15" L x 10" W - 7. 45 lb 
28" Upright Dimensions: 28" H x 17. 5" L x 11" W - 9. 2 lb