a wafer container with a door , the door has at least one latching mechanism , wherein the latching mechanism has a spring member that holds the latching mechanism at one or more desired positions that preferably correspond to latch - open and latch - closed conditions . in a preferred embodiment , the spring member has an over - center condition that urges the latching mechanism towards the favored positions , thereby resisting unintended actuation of the latching mechanism . moreover , in preferred embodiments , the latching mechanism has soft stops at the latch open or latch closed condition that minimizes abrupt snapping into position of the latching mechanism . preferred embodiments utilize a rotatable member configured as a cammed member with an elongate rigid plastic member having at least one node , forming a plastic spring . the spring is pivotally mounted on the rotatable member and pivotally mounted to the door structure .