Classic Polycarbonate Carry On 4 Wheel Spinner Travel Case Black. Rediscover a timeless design with the new Zero Halliburton Classic Polycarbonate Carry On 4 Wheel Spinner Travel Case. Polycarbonate hardside construction, custom designed draw-bolt latches as well as a three digit TSA approved combination lock, this case will protect your valuables around the globe. Four wheel spinner design built with sealed ball bearings as well as a multi stage retractable h