Bivy sack

Discussion in 'Sleep Systems' started by Poeschel, Sep 29, 2018.

  1. Poeschel

    Poeschel Supporter Supporter

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    Hey all, looking for a light bivy sack to protect my down bag when tarp camping, any suggestions? Thanks
     
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  2. to Ha

    to Ha Supporter Supporter

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    What part of the country will you camp in?

    I haven't had much luck with bivies. They just don't breathe. EXCEPT, that is, for the ones from Milesgear.com. And bug bivies!

    Milesgear uses mateial similar to frogg toggs (not fuzzy though) and actally passes some moisture through with water resistance. IF you are in a low humidity area, you'll have better luck.
     
  3. freebirdfb

    freebirdfb Bushmaster

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    I have used the USGI bivy and mms in weather down to light snow without a problem. I have thought about upgrading but I don't need to. But I do not currently have the mms sleep system, just the bivy.
     
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  4. Youcantreadinthedark

    Youcantreadinthedark Amphibian. Supporter Bushclass I

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    If I were using down I dunno if I would bivy up. There'd be an awful lot of condensation in there. Having said that, I'd never heard of the milesgear mentioned above, it may be light years ahead of my REI bivy in terms of wicking.
     
  5. NevadaBlue

    NevadaBlue Graybeard Supporter Bushcraft Friend Bushclass I

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    I have a couple of the military bags. They are lightweight cotton canvas. Like ‘em.
     
  6. mtwarden

    mtwarden roaming the Big Sky Supporter

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    if you're using a tarp then you want a bivy that has a breathable (but water resistant) top, waterproof bottom- Mountain Laurel Designs Superlite bivy is what I use- all of 5 oz AND includes a bug net top if needed

    there is no condensation with this type of bivy, but obviously it's to be used in conjunction w/ a tarp- it's role is to simply keep any errant precip that may find it's way under your tarp

    as a bonus it'll add 5-ish degrees to your sleep system :)
     
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  7. justinspicher

    justinspicher Scout

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    I’ve heard good things about the mountain laurel design bivys, but haven’t tried one. I’ve used the USGI bivy a lot and in some sketchy conditions. It’s bombproof.

    Currently I am running a Titanium Goat Ptarmagin and it’s really light as well.
     
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  8. mtwarden

    mtwarden roaming the Big Sky Supporter

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    the Ti goat Ptarmagin is in the same genre as the Superlight- breathable top, waterproof bottom, very lightweight- perfect for smaller tarps

    [​IMG]
     
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  9. to Ha

    to Ha Supporter Supporter

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    I like MLD's & Ti Goat's bivies but I do get condensation in them. Granted I am in FL, but there are many other humid parts of the country where condensation can occur.

    Condensation management got better when I started wearing minimal baselayers to bed, then ONLY add more layers if I feel a chill. BEing too warm exasperates condensation.
     
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  10. mtwarden

    mtwarden roaming the Big Sky Supporter

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    ^ yeah my clime is definitely on the drier side, but even with rain, I've never had an issue with condensation (knock on wood :))
     
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  11. Poeschel

    Poeschel Supporter Supporter

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    Thanks guys, I’ll check out the suggestions. This is the first year of going out with a quality bag so I want to take the steps to protect it. Thanks again.
     
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  12. mtwarden

    mtwarden roaming the Big Sky Supporter

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    in addition to MLD and Ti Goat, also check out Borah Gear too- stay away from the fully waterproof ones for use w/ a tarp, water resistant (breathable) is what you want
     
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  13. HeadyBrew

    HeadyBrew Supporter Supporter Bushcraft Friend

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    I also have a Ti Goat Ptarmigan. I’ve only used it a couple times but it’s so light and packs so small that I always have it just in case.

    That said, I’m in the NE of the country and the few times I did use it (fall season), I had moisture build up by morning. Nothing to the point of soaking, and I run down bags exclusively, but it was still a minor concern. I would say if you go that route and plan to bivy over multiple days in a down bag, you’ll want to make sure you have the ability to dry it out during the day.

    They are not cheap either. You can buy a decent tarp for the same cost as the bivy.

    Just my $0.02.

    PS, I rarely use the thing as I’m predominantly a hammock guy. If you decide the ptarmigan is something you want to try, I’d likely part with mine for less than new.
     
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  14. Poeschel

    Poeschel Supporter Supporter

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    PM sent
     
  15. Doc.

    Doc. Scout

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    The SOL Escape bivy breathes very well. However they’re not made for big men. Folds up tiny and is extremely packable. Doc.
     
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  16. caoimhin_s

    caoimhin_s Tracker

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    Personally, I wouldn't recommend using a bivy with a down bag without also using a vapor barrier liner. From my experience, even if you have a "breathable" bivy, you'll have more condensation from body vapor than you'll get from drips off your tarp.
     
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  17. Kona9

    Kona9 Supporter Supporter

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    82485F6B-0C2B-4CE9-94EC-8DD928936ACC.jpeg EAACF8F5-41B9-4FCF-80C3-005C3875E7A6.jpeg Borah Gear is very good. Received excellent customer service from them this past summer on an order that I wasn’t sure would arrive in time for camp. My son and I have slept five nights so far in the bug bivies. Very lightweight due to mesh, but even the partial mesh versions are light.
     
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  18. themadindian

    themadindian Supporter Supporter

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    I used the MSS bivy for years and switched to quilts but the MSS bivy took away some of the loft. I switched to the sprawler UL bivy saving 30oz, which has been great and haven't had any condensation issues. I have put on the Christmas / birthday wish-list an enlightened equipment recon bivy as that has a bugnet and I dig the design of it
     
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  19. hlydon

    hlydon Guide

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    So true from my experience.

    I have a military bivy that is quite weather proof, but it doesn’t matter what the temperature is. I still wake up lying in sweat.
     
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  20. mtwarden

    mtwarden roaming the Big Sky Supporter

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    there is a huge difference between "breathable" like Goretex- which really isn't breathable at all (but certainly waterproof) and really breathable fabric (but definitely not waterproof, but water resistant)- they are not comparable

    it's like comparing a goretex rain jacket and a windshirt- one breathes, one doesn't, one is waterproof, one isn't- apples/oranges
     
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  21. Akela

    Akela Scout

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    NevadaBlue,

    Are you talking about the case/cover that was made for the M1945 sleeping bag?
     
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  22. NevadaBlue

    NevadaBlue Graybeard Supporter Bushcraft Friend Bushclass I

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    One of those and some european one. Seem to be straight cotton.
     
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  23. Akela

    Akela Scout

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    Appreciate that info, NevadaBlue. Thanks!
     
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  24. NevadaBlue

    NevadaBlue Graybeard Supporter Bushcraft Friend Bushclass I

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    I used an old military mountain bag that has down/feathers in it, with the cotton cover last February or so... wasn’t below freezing outside and was cozy in the bag.
     
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  25. Odie

    Odie Scout

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    Take a look at the Chinook Summit bivy and the Snugpak Stratosphere. Both are the same design. I have a Chinook. I've known others who what the Snugpak.

    I like that the poles allow it to be free-standing and don't require it to be tied down or up to keep the bivy off your face.
     
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