Forum Index » Make Your Own Gear » Tyvek bivy with Down Bag?? Bad Idea??


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Michael Barber
(barber5) - F

Locale: Midwest
Tyvek bivy with Down Bag?? Bad Idea?? on 05/15/2008 13:24:07 MDT Print View

Is it a bad idea to use a down bag with a MYOG tyvek bivy? I would think the condensation would be bad for the bag. Should a synthetic fill only be used with a tyvek bivy?

Help!
Jeremy Greene
(tippymcstagger) - F

Locale: North Texas
VBL on 05/15/2008 13:28:49 MDT Print View

I expect you will need a vapor barrier with either insulation.


Can anyone here comment on VBL use in above freezing and milder conditions?

Edited by tippymcstagger on 05/15/2008 13:31:00 MDT.
Michael Barber
(barber5) - F

Locale: Midwest
Vapor Barrier? on 05/15/2008 13:30:40 MDT Print View

Vapor Barrier? Not exactly sure what that is.
Jeremy Greene
(tippymcstagger) - F

Locale: North Texas
VBL on 05/15/2008 13:37:12 MDT Print View

It is an impermeable layer between your body (wet/vapor) and your insulation (dry). I think Western Mountaineering sells one, or you can go cheep and tape a couple trash bags together.

I still haven't tried this but it by no means a new idea.
Michael Barber
(barber5) - F

Locale: Midwest
Is it necessary in the spring/summer? on 05/15/2008 13:40:57 MDT Print View

Would this be necessary in the spring summer months? Or more a winter thing?
Roger Caffin
(rcaffin) - BPL Staff - MLife

Locale: Wollemi & Kosciusko NPs, Europe
Re: Is it necessary in the spring/summer? on 05/15/2008 15:49:49 MDT Print View

BBL is a bad idea above freezing, and quite unnecessary as well. It becomes useful some distance below freezing.
Search the Forum for it in other threads.