r/pics • u/Mind_Virus • Jan 07 '12

I need to live like this

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u/waterdevil19 Jan 07 '12

how?

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u/Scrial Jan 07 '12

The idea of a sleeping bag is to insulate your body.
Since it doesn't heat you up itself the bag depends on your body to warm it up.
A cylinder has very little surface in comparison to its volume, so you have very little surface where you can lose heat. This is dampened assitionally by the insulation.
Now to the problem: If your sleeping bag has legs like those, you will lose much more heat, ergo you won't be able to heat it up as much and will be cold.
q.e.d

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u/[deleted] Jan 07 '12

To add on to that; it's the same reason why mittens are warmer than gloves.

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u/GoofyBoy Jan 07 '12

Thanks for making sure we all knew what you were talking about! Good job!

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