Classic Polycarbonate Carry On 2 Wheel Travel Case Gun Metal (GM). Rediscover a timeless design with the new Zero Halliburton Classic Polycarbonate Carry On 2 Wheel 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. Smooth rolling wheels constructed with sealed ball bearings as well as a multi stage retractable handle