I recently bought a fairly large (maybe holds 6 Boxes) Tupperware container to store my full boxes of cigars. I have a Xikar 250 count crystal Humidifier, I am using their Propylene Glycol solution and I have a Xikar digital Hygrometer (which has been salt tested and calibrated). When I placed the activated crystals in the Tupperdor, the RH% went up to 90% and stayed there. So I thought maybe I needed to put some cedar in it. Yesterday I made a cedar bottom to place in it. This morning, still 90%. I have taken my cigars out for now, but I have more coming in today. Have any of you run into this? Is the problem the plastic of the Tupperware box, or is there something else I am missing?