The recent post re: Blizzard Bags resulted in the US distributors kindly sending one for examination. Longtime members will recall the group input on condoms for emergency canteen. A series of posts resulted in a remarkable document. I thought we would use this method again. I will post preliminary information so we all have the same vocabulary. If I make any mistakes forum members can point them out. We will first discuss the mechanisms of heat loss and generation, a history of the space blanket, and finally ( hopefully on what I can assemble) a review of the Blizzard Bag and any market competitors in term of materials etc. There are a few known and not so well known products that may be usefull additions to an emergency system we can discuss. Finally a appraisal of performance and specific use and value. I will also be invitng the makers to answer any questions.