Device for controlling headspace humidity and methods for making the same

A method of producing a humidity controlled product package, the method comprising:

• providing a pre-package material having an interior surface;
• providing a stack comprising:
• a plurality of individual humidity control devices, each humidity control device comprising:
• a base layer;
• a permeable layer comprising a material permeable to water vapor, the permeable layer including one or more registration markers, the permeable layer also including a concave area inside the one or more registration markers, the permeable layer coupled to the base layer;
• and
• a humidity control agent arranged between the base layer and the concave area between the one or more registration markers of the permeable layer;
• a delivery strip, and
• an adhesive holding the humidity control devices on the delivery strip;
• separating an individual humidity control device from the delivery strip while leaving the delivery strip intact;
• adhering the separated individual humidity control device to the interior surface of the pre-package material;
• and
• after adhering the separated individual humidity control device to the interior surface of the product package material, forming the pre-package material into a product package having product compartment such that the humidity control device is adhered to an interior surface of the product package within the product compartment.