RE: thermacell
Thermacell's don't get hot enough to cause any problems. They recommend that you strap it or lay it flat for best results. They even say that hanging it upright can cause the unit to malfunction. However, on my bear hunt in Alberta last May, the guides all wore them on their belts. They worked beautifully both on their belts and in the tree stands while hunting. I have on several occasions used the blue scent pads for a couple of hours and used the same one the next day. I have never noticed any difference in odor or functionality.