Bests & Worsts Reviews from Amazon

I figured I'd actually use this to see what it's like. I spent part of last night outside, the house, using only this and my sleepwear for insulation (and a pillow). The temperature was about 60F--not severely cold, but this is California and I can't control the weather! This bag does work, but there are a few things to know. First, I was sufficiently warm. Second, I was a little wet. This is essentially a 3'x6.5' mylar bag with a silver interior and orange exterior. Because this is a mylar bag it is not breathable--there is no ventilation. Your body is constantly emitting small amounts of water, even when not actively sweating. After an hour and a half there was a condensed layer of water on the interior of the bag, so it felt wet everywhere I touched it. After using this you will need to air it out so it can dry. Third, this has no means of constricting the opening, so you will need to wrap it around yourself to retain heat. Fourth, the mylar bag is reusable, but getting it folded back up so it fits into the tiny nylon holding bag is very frustrating and takes a lot of patience. Your body emits a lot of hear through your head. Always wear a hat when using this--you'll stay warmer. The bag itself is seems reasonably tough. It'll take some abuse, but I think branches etc. will rip it open pretty quickly. The seam tape seems to be sufficiently tight.