Light weight. Efficient. Surprisingly durable. 100% better than a “space blanket”. I carry this in my pack winter and summer on day hikes because unlike overnight hikes, I do not carry a tent or sleeping bag. Some people carry a so-called space blanket. People I have talked to who have used space blankets in emergencies have very mixed reactions. They find they can not keep them secure around them in a wind for one thing. On the other hand, this bivy sack is secure and creates an envelope around you so it substantially reduces convective heat loss. It provides zero…

i bought this as an add on purchase. I’m … i bought this as an add on purchase. I’m 6ft 330lbs, and I could fit in it! now i have to figure out how to fold it back together. i plan on putting it in my winter car care bag.