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Old Sweat said:The sleeping bag we used in the sixties had a flannel liner and two "bags," an inner one and an arctic outer one. The combined bag would keep a soldier warmish for four or five hours in -50 f temperatues, and I am speaking from experience here. The bag also did not have any zippers for closure. Instead it used flaps and overlap. This apparently was because zippers could freeze in the cold. (There is the story we all heard about American troops in Korea discovered killed in their bags with frozen zippers, or at least that is what we were told.)
The only difference between your bag and the ones issued today are the zippers. There is a bit of overlap to cover the zipper portion, but otherwise pretty much identical.