the reason would be that it's been tried by many and yes it can work...but it's not the best solution it had many drawbacks ...
it could work fine for warmer weather...but would you really trust this setup at 30 degrees ...i wouldn't
2nd thing is condensation ...you will have problems with condensation using any type of space blanket ...and you don't want to deal with a wet sleepingbag/quilt in the middle of the woods on a really cold day
yes you can vent it to help keep it down...bu again...more things to fiddle with
3rd...if you rip it...there goes your UQ..theycan rip pretty easy yes f it's a small rip you could fix it...bu if you rip it in half...your done
I'm sure there are more reasons why this idea never took off...
i'm not trying o shoot down the idea...i'm just pointing out the fact that i think just about all of us have tried it and there is a reason we all moved on to down or Synth UQ
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