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Bivy Sack
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Andrew Wolff

Locale: Chattanooga
Bivy Sack on 05/16/2008 20:23:34 MDT Print View

Hi all, just thought I'd post some pictures of the bivy sack I recently completed. This is the first large myog project I've done, until now all I've made were stuff sacks. I guess this is similar to a meteor bivy but I sewed it from a patern of my own making. I was going for a nice fitted design.

The bottom is silnylon the top is teflon DWR and nanoseeum mesh all from Thruhiker. I used the cheaper and heavier materials for my first attempt. I'm planning on making a second one with momentum and spinnaker. I don't have a scale so I don't have a weight for this yet but it doesn't seem to be very heavy. The zipper runs all the way around the mesh and then on down the right side allowing the mesh to be folded down out of the way if not needed. which for me will be 80% of the time.

Bivy sack 12

bivy sack 16

bivy sack 4

bivy sack 20

Last weekend my wife and I were out for two nights in the Nantahala National Forest and I got to test the bivy under a GG Spinntwinn tarp. We had thunderstorms with very heavy rain both nights and the bivy sack did great!

Charles Mason
(guesting) - F
***** on 05/21/2008 08:07:05 MDT Print View

Best report I ever saw. No waffle, to the point on all important aspects, honest and picture/word perfect. No questions.

Bivy looks good too and looking forward to compressed volume on V.2. Keep going.

Diplomatic Mike

Locale: Under a bush in Scotland
Bivy Sack on 05/21/2008 13:57:49 MDT Print View

That looks good Andrew. I like the high 'bathtub' floor. No chance of groundwater contacting the breathable top.

Tim Marshall
(MarshLaw303) - MLife

Locale: Minnesota
Re: Bivy Sack on 05/21/2008 15:29:48 MDT Print View

is there a chance that walls that high will increase interior condensation? i don't use a bivy so i wouldn't know, i just wonder.

Skruffy McGruff
(skruffy) - F

Locale: Central Oregon
good job on 05/22/2008 01:01:04 MDT Print View

That's quite impressive for a first attempt. So far I've been a little intimidated to begin my two project goals, a bivy and a tarp shelter. Seeing the successful projects here is giving me "umf" to try. Thanks for posting.

David T
(DaveT) - F
. on 05/22/2008 10:06:17 MDT Print View


Edited by DaveT on 11/20/2014 20:14:53 MST.

Tim Marshall
(MarshLaw303) - MLife

Locale: Minnesota
Re: good job on 05/22/2008 15:17:11 MDT Print View

don't be afraid to try making a tarp.

sewing a rectangular tarp is the easiest thing to sew, i'd say only slightly tougher than a stuff sack. only harder because of the size of the panels. If you can sew a semi-straight line you can sew a tarp. a 5x9 is only hemmed on the edges, and anything else has a ridge line and then is hemmed on the edges.

Andrew Wolff

Locale: Chattanooga
Bivy Sack on 05/22/2008 21:51:55 MDT Print View

Thanks Guys,

I don't know yet whether the higher floor will lead to more condensation, it didn't seem to be a problem first time out. I will be getting it out again soon for further testing and will report back. I can't see why someone is not already selling a bag along these lines, I would have bought one... o well.

Diplomatic Mike

Locale: Under a bush in Scotland
Bivy Sack on 05/23/2008 12:08:43 MDT Print View

Hopefully condensation isn't a problem. As someone who frequently sleeps on very wet ground, i would gladly accept the trade-off of maybe more condensation, against the top fabric touching wet ground and wicking into the sleeping gear.

John Brewder
(777zzz) - F
Re: Bivy Sack on 08/05/2008 02:27:02 MDT Print View

Really nice project. I don't know much about outdoor gear materials. I have a few questions. How water resistant are the nanoseeum and DWR materials? I suppose they're not waterproof because you used a tarp when it rained. Are they not entirely waterproof because the upper portion of the bivy needs to be breathable so that condensation does not accumulate? Is there any such thing as a truly waterproof bivy? Thanks.

Jared Cook
(rooinater) - F

Locale: Northwet
Re: Re: Bivy Sack on 08/05/2008 17:22:14 MDT Print View

nanoseeum is mesh, so it's definitely not water proof.