Awhile back, I saw an S/P poster favorably comment that he owned this bag. Snugpak is a reputable manufacturer as far as I can tell. I had the opportunity to buy this bag for $53 so grabbed one. Very light and compact, 27 ounces. Nice. Great for keeping in the car for that unexpected situation. I tried sleeping in it two nights ago, at an empty house that's remote from where I live. I was sleeping on a cot with this bag. The (functioning) heater for the house was turned to 64 degrees that night. I was wearing longjohn bottoms and a fleece sweater (over a t-shirt) top and socks inside the bag (I wanted to keep the bag as clean as possible, which is why I had all my skin covered--I wasn't concerned about being cold at the time I went to sleep. California, heated house, body covered in clothes, bag rated to 45...) I was really cold that night. Woke up a half dozen times, curled into a ball to retain warmth. This bag is rated "45 degrees comfort / 36 degrees low" by the manufacturer. How is it possible I was sleeping in a heated house at 64 degrees, wearing 'johns, socks, and a fleece sweater, and was freezing my arse? What do these ratings of 45/36 mean? I was 20 degrees above the "comfort" rating and quite uncomfortable. Never had this experience in a sleeping bag before.