Last year I was on a campout where I was a bit chilled at night when the tempuratures dropped lower than expected. My Colman bag was rated to 0 degrees F, as I recall, but it didn't seem comfortable when the early October night dropped to 17 degrees F. <br><br>It was my first experience with cold weather. Since the bag was rated to zero, I didn't expect any problems. So I was a bit surprised when I couldn't get comfortable. I was wearing a hat on my head, but the wide openning at the top (not a mummy bag) let cold air in, even when I "folded" the corners under my shoulders. I tossed my coat over me too, but the bottom third of the bag was not covered. I was never in danger, just uncomfortable. <br><br>I wish I had thought of my poncho. I have a large, used French military poncho that I could have rolled around my bag. I would guess that would have made the night more pleasant.<br><br>Live and learn. <br><br><br>