A packing device for transporting a long conveyor belt, and a conveyor belt wound over and across a pair of components of the packing device. The packing device has a pair of bobbins each comprising a take-up drum with radially extending discs fixed to both the ends thereof, and a long conveyor belt is wound over the respective bobbins with approximately the same turns on each bobbin. An opening for a shaft for rotation is provided in the center of each of the bobbins, and outwardly-directed ring-shaped flanges are provided around the circumference of each opening and in the periphery of each disc, respectively. The top ends of the ring-shaped flanges around the opening and in the periphery are bent towards each other, forming L-shaped portions in section.