Abstract: An invented container closure system includes a first side having one or more keys, which are pieces of material shaped to stick out from a substantively smooth container or cap shape, and a corresponding second side having one or more gaps in a ledge, such that if and only if the cap is turned to the correct position relative to the container, the keys fit through the gaps and are not blocked by the ledge, and the first side may be uncoupled from the second side. Additionally, one or more flexible nubs may be positioned beneath the ledge of the second side such that channels indented into the outward surface edges of the keys of the first side fit around the nubs, allowing the nubs to laterally traverse through the channels when the sides are coupled together.