The present invention provides a multilayered ceramic substrate having high precision and high reliability in which firing shrinkage in the planar direction thereof is suppressed and densification is achieved. A straight guide groove along the optical axis is formed on an inner peripheral surface of a first lens barrel, and a straight guide projection that is guided by the straight guide groove is formed on a second lens barrel. Upon establishing contact with the recipient, the system allows the intended recipient to schedule delivery of the package. Upon request from a given entity, a given storage site from which the given entity may retrieve the content is then identified. The PCM is contained in flexible packages. Compliance required for the baby bottle holding system is achieved by the cooperative combination of the elliptical cavity, the flexibility and softness of the trapezoidal element and the tension imposed by the adjustable straps.