The present invention is directed to a stackable container system that includes containers and lids that are configured to allow any of the lids to be used on any of the containers. The embodiments provide an aerodynamic structure attached to the rear in a manner that would obscure access to the door in a deployed position, in which the structure reduces drag, yet enables access to the door in a folded position. A second forcing function is applied to the loading tray to overcome a greater magnetic attraction when the optical disk is not placed on the loading tray. It is particularly preferred that the bonding is performed with the use of a solder composition composed, by weight, of 78% or more but 79% or less Au, and the balance Sn as the solder and furthermore through plating the cap with gold.