Zipped Bivvi

[Laurence Milton]

Gas Permeable Gore Tex fabric allows to close the bivvy bag and actually breath through the fabric.
(What you can NOT do with any other bivvy bag.)
And they told me that if you do that all the night you will get condensation problems.
That means that you will get such problems in every hooped bivvy bag.
If you want to keep your sleeping bag dry you simply need to breath out of the bivvy bag!

The thing about hooped bivvies is that they have ( weather allowing) better ventilation to reduce that issue.(certainly the Snugpak)
Personally I would only be interested in using one in clement conditions as well.........?

 

[Erbswurst]

I think they cause more problems than they solve.

My plastic tents are also ventilated very well and I get water inside of the outer fabric pretty soon.

Unsure, but it seems to be something like a nature law, probably having something to do with physics.

 

[Laurence Milton]

I think they cause more problems than they solve.

Could have a point there...............