I like to carry a 90 year old Hudson's Bay Double Blanket with me. I sit in a regular lawn chair and wrap the blanket around my middle. On the ground, under the chair, I light a fair size candle. The blanket folds into four thicknesses and holds in my body heat and the heat from the candle. Add a pair of Lacrosse Iceman boots, some good insulated coveralls, a touch of blase orange, a thermos of coffee, and I'm good to go.