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> I packed an air mattress to sleep on during camping when it was cold on the ground. The air didn't insulate as well as I expected so I was freezing from below.

No sleeping bag?

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No, for some reason I decided to use a regular duvet. With a sleeping bag it would probably have been less of an issue.

I was going to say, I never really understood why sleeping bags seem to be the default for camping but I get it now.

They're warmer, more comfortable, easier to carry...

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