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Source: https://outdoors.stackexchange.com/q/5369
License name: CC BY-SA 3.0
License URL: https://creativecommons.org/licenses/by-sa/3.0/

<p>I'm actually shopping for a new sleeping bag and am a bit in doubt about a question that I do not find treated anywhere: By investing an arbitrarily huge amount of money I can buy a sleeping bag to sleep snuggly down to -30° C and even below. But what about the other side? Let's say, I buy a sleeping bag with a comfort rating of somewhere between 0 and -10° C, can I use it also in a warm summer night? Or is there some temperature where it will be just too warm to use it even with zipper fully opened and used more like a blanket?</p>

<p>I'm aware of the fact that I will carry more weight and volume than necessary for an insulation that I would not need. I'm just interested about the comfort at the warm end of the temperature scale. So if I buy a bag with some reserve for cold fall or winter nights, will it be unusable in summer or only not the best choice I could have had? If it is unusable above a certain temperature is there some rule of thumb that says something like "a bag that has a comfort rating of <em>X</em> won't be of use for temperatures roughly <em>Y</em> degrees above that <em>X</em> rating."</p>