Mine is a $12 $20 blanket from Amazon. It's heavy, but the way I have it mounted to my chest armor I don't even notice it. (it was $12 when I ordered it in 2016)

https://i.imgur.com/U4iura7.jpg

https://i.imgur.com/AA0exJe.jpg

https://www.amazon.com/gp/product/B007JIYYYO/ref=ppx\_yo\_dt\_b\_search\_asin\_title?ie=UTF8&th=1