Condensation and bivvy bags?

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Bearbonesnorm
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Condensation and bivvy bags?

Post by Bearbonesnorm » Sat Jun 25, 2011 9:00 am

Anyone else suffer with small amounts of condensation in bivvy bags? I've used various bags over the years from the cheap to the very expensive but 90% of the time there'll always be a small amount of condensation inside by morning ... even with an eVent or Goretex bag.

It's nearly always down towards my feet and nowhere else ... I'm thinking either I always sleep downhill or I have superheated feet during the night.

Anyone else ever notice?
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Matt
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Re: Condensation and bivvy bags?

Post by Matt » Sun Jun 26, 2011 10:54 pm

Yep, Hunka XL feet only on this years WRT.

didnothingfatal
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Re: Condensation and bivvy bags?

Post by didnothingfatal » Sun Jun 26, 2011 11:03 pm

I've always been led to believe it's due to feet overhanging the mat, and the difference and heat loss to ground temp.

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Ian
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Re: Condensation and bivvy bags?

Post by Ian » Mon Jun 27, 2011 10:11 am

Was out last under just a tarp - got a bit of condensation/dew at the end of the sleeping bag (no bivi bag). Think it was just a problem with a short mat and improvised camelbak/ shoes laid at the foot end. Starting to see the merits of a full length mat over the lighter shorter versions.
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Matt
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Re: Condensation and bivvy bags?

Post by Matt » Mon Jun 27, 2011 10:14 am

Full length NeoAir used. Tested the bivi bag by filling it with water and it was fine so the water came from me.

My top half was under cover and my feet in that Saturday's biblical rain. I just assumed it can't breathe if its wet through on the outside. ?

didnothingfatal
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Re: Condensation and bivvy bags?

Post by didnothingfatal » Mon Jun 27, 2011 8:11 pm

Ian, is that an MKettle in the picture, if so opinion?

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Ian
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Re: Condensation and bivvy bags?

Post by Ian » Mon Jun 27, 2011 8:33 pm

Yes, it is. Opinion? I'm somewhat unsure at the moment - I'll start a separate thread with more details.

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Bearbonesnorm
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Re: Condensation and bivvy bags?

Post by Bearbonesnorm » Tue Jul 05, 2011 6:25 pm

Am I being stupid or is it possible that there maybe some relationship between condensation in bivvy bags and whether or not you're under a tarp?
What value a life half lived if the half you lived was the wrong half?

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