Wow. You're certainly pretty lucky to be alive if you ended up with a bad concussion. Good on you for having the sense to take a survival blanket with you. I bet a lot of people don't take one on their person while out in the bush and it could definitely be the difference to surviving a night or not.
As an aside a good brand of Survival blanket is AMK or Adventure Medical Kits. They have a few varieties even a bivvy style that is re-usable.
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