Abstract: A humidity-stabilizing device for tobaccos or dried herbs that can be attached to the interior of a lid of a container to control relative humidity in the container. The device is a sealable container with internal compartments which are divided by a moisture-permeable barrier. The compartments separately hold moisture-absorbent material and humidity-stabilizing silica gel beads that together maintain the relative humidity of the container by action of evaporation and absorption. Because evaporate rather than water is employed in the humidification process, tap water rather than distilled water can be used to wet the moisture-absorbent material.