The US issue “woobie” is probably the most globally cherished kit of surplus in inventory. Originally, it was just a poncho liner… but soldiers quickly figured out that it made for a comforting blanket that both keeps you warm and reminds you of a softer place.
These things were so cherished, in fact, that when the Pentagon recalled them, soldiers revolted.
Anyway, they also make for great blankets to keep in your car. They compress to a small size, stow easily, and keep you warm enough in a pinch.
Get a real one here.