I spent last night out in the woods hammocking, with my sleeping bag inside a bivvy bag. Woke up this morning, and the sleeping bag is soaking wet on the outside (dry on the inside) while the bivvy bag is soaking wet on the inside (and dry on the outside).
It would appear that the bivvy bag isn't breathable, as it has allowed a massive amount of condensation to build up.
The bivvy bag in question is a Mil-Tec one, with a zipper on the right-hand side.
There was no condensation under my tarp, nor under the cover above me on the hammock (it's the Warbonnet with the "solid" top on), nor on my wool blanket. Basically, everything else was perfectly dry but for the outside of my sleeping bag (which still hasn't dried) and the inside of my bivvy bag.
Is it normal for bivvy bags to collect enough condensation to saturate a sleeping bag? Surely Goretex is designed specifically to allow air through and keep water out... so to my mind if it were genuinely Goretex, this wouldn't have happened, right?
First experience with a bivvy bag... not at all pleased! Any input welcomed.
It would appear that the bivvy bag isn't breathable, as it has allowed a massive amount of condensation to build up.
The bivvy bag in question is a Mil-Tec one, with a zipper on the right-hand side.
There was no condensation under my tarp, nor under the cover above me on the hammock (it's the Warbonnet with the "solid" top on), nor on my wool blanket. Basically, everything else was perfectly dry but for the outside of my sleeping bag (which still hasn't dried) and the inside of my bivvy bag.
Is it normal for bivvy bags to collect enough condensation to saturate a sleeping bag? Surely Goretex is designed specifically to allow air through and keep water out... so to my mind if it were genuinely Goretex, this wouldn't have happened, right?
First experience with a bivvy bag... not at all pleased! Any input welcomed.