
SO WHAT'S IN A BAG RATING?
All sleeping bags should have a usable temperature rating, giving you an idea about what temperature ranges the bag is suitable for.
Unfotunately, some ratings are exagerated, giving you an incorrect idea of just how good the bag is.
There are also other factors that affect the ability of the bag to keep you warm. These factors are:
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Wind
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Shelter (such as a bivy bag)
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Your metabolisim and fitness
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Additional clothing
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Eating before sleeping
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Insulation from the ground
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Sleeping in a group
THE COMFORT TEMP MEANS...
This is the temperature at which you should have a warm nights sleep in your base-layer clothing, with little or no shelter. Remeber, the above factors will affect this rating.
THE EXTREME TEMP MEANS...
This is the lowest temperature that you can survive the night in the bag, with full shelter, a full tummy, insulation and wearing ALL but your outer extreme cold clothing layers, and packed in close with others. More than likely, it will still be an uncomfortable night, but you'll live.
Choose the comfort rating as the lowest temperature you expect to be in. That way, you'll have reserve warmth capacity if you need it.

Carinthia Combat Bivy and Tropen Bag |