A cord lock includes a female member with a cylindrical shape, a male member movable along an axial direction of the female member and receiving a part of the female member, and an urging device for urging the male member in a direction to project from the female member. For every key K representing a record R in the index, the key of the children records of record R are prefixed with K. The system uses the principle that matter in a liquid state will absorb and attenuate terahertz radiation to a larger degree than matter in a semisolid or solid state. Additionally, in one embodiment, the container is configured to prevent or reduce shock and vibration from being transmitted to objects within the container.