try silica gel desiccant inside of the mylar bag. I might dump the bulk, weight, cost and flame/water risk of the absorbent painter's dropcloth bag. Lately, it hasn't been cold enough to find out anything new. Can dry out the 1/4 lb of silica gel in the canteen cups, over the fire. It has very low bulk and it will also help to dry out damp clothing or debris-insulation, too. Can use it in couple of net-bags, for comfort in the sleeping gear and exposure to the moisture, and then return it to a water-tight can while not sleeping. Turns out that the crystalline cat litter is silica gel. Can carry it in the Platypus bag normally used as the pee jar. Wont need to pour the silica into a net bag, (letting it absorb moisture) if I'm not in the sleeping bag.