Four double wheels
BOXING is the strongest suitcase on the market. Made of Polypropylene, Boxing is light and hard as a stroke of Muhammad Ali. In several colors to choose from,it has a sporty but elegant design: the surface plays with the matt and the bright. Apart from being an indestructible suitcase, it is expandable in all 3 sizes, so there is always a little more space. Its 4 double wheels make it move smoothly on any terrain. It is the ideal suitcase for large trips or for those seeking resistance. It is ready to endure all your adventures and you will get bored of it before it breaks. In a 10-round, BOXING would win.