Bundle-of-electric wire container

A single-piece container for containing a bundle of electric wire wound in a loop shape, the container having an inner perimeter and an outer perimeter and comprising:

• a base having a circular outer edge having an outer perimeter for defining an outer perimeter of a bundle of electric wire mounted on the base, and a surrounded portion surrounded by the outer edge, the surrounded portion having a center hole formed therein;
• a core extending upward from an edge of the center hole of the base for holding an inner peripheral portion of said bundle of electric wire mounted on the base, the core including a plurality of core pieces;
• and
• an outer cylinder extending upward from the outer edge of the base, the outer cylinder opening upward and surrounding the core to define an annular bundle-of-electric wire containing space between the outer cylinder and the core, the outer cylinder having a height and having a diameter in its lower portion that is smaller than that in its upper portion so that a plurality of like bundle-of-electric wire containers can be stacked in a plurality of upper and lower stages while each contains a bundle of electric wire therein,
• the base including means defining grooves which are substantially triangular, the grooves being formed between the core pieces and extending radially outward from connection with the center hole,
• the grooves receiving the core piece of a lower stage container if the container is stacked in a plurality of stages with such lower stage container.