I know that these ratings tend to vary given how well the person using the sleeping bag handles the cold and other weather factors. But after this past weekend, I'm fairly confident this is closer rated to 50 degrees than 45. I was camping around Asheville, NC this weekend for 3 nights and tested this out in actually cold weather (40s and 50s versus 60s and 70s, which is what I tested it at last time). It worked fairly well but I give it about a B- for how it handles actually cold weather. The tempertures for the weekend were between 45ish and 55ish and on the 45ish night I was bundled up in 2 tops, a beanie, very thick Smartwool socks and Smartwool thermal base layer pants and I was just warm enough. Even at 55ish I was wearing extra clothes to keep me warm and, as far as I'm concerned, if a sleeping bag is rated for a temperature, I should be able to use it in just my underwear...or at least very minimal clothing. Still, I love that it's so compact and otherwise well-made. It definitely does the trick for almost 45 degrees.
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