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  1. #1
    kamileon's Avatar
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    Military Module Sleep System

    I have acquired another module sleep system, as pictured below. The label on the ends say the green bag is rated for 30* and the black bag is rated for -10* and layering them together gets you down -50*. I have slept in the black bag before but only down to around 18* and it did keep me nice and toasty. My plan was to strip the zipper and hood off and use it as a TQ, the foot box is already sewn in. My question to everyone is, has anyone used these in temperatures below 0*? I was wondering how accurate the temp ratings were.

    gi modular sleep system.jpg
    "I may not have gone where I intended to go, but I think I have ended up where I needed to be." Douglas Adams

  2. #2
    cmc4free's Avatar
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    My understanding is that when they're layered together the combination is rated for -10F and can be pushed to -50F "when used with various insulating layers of the extended cold weather clothing system." And I don't know this for a fact, but I assume those are EN/ISO extreme/survival ratings, not comfort or lower limit ratings.


  3. #3
    TxAggie's Avatar
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    Ive had the black one on its own down to the single digits. Ive never been out any colder than that so I cant vouch for how much extra you get with doubling them up.

    I do know you need a pretty sizable pack to fit the two layered together.


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  4. #4
    Black's Avatar
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    Military Module Sleep System

    Stayed warm at -7 using the entire system on my deck with two closed cell pads underneath. Napped off and on for 3 hours. Condensation from breathing got the best of me and I retreated to the house. I found that it was easy to over heat when using the green and black bags inside the bivy.
    "No matter where you go, there you are." ~ Buckaroo Banzai

  5. #5
    kamileon's Avatar
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    Quote Originally Posted by cmc4free View Post
    My understanding is that when they're layered together the combination is rated for -10F and can be pushed to -50F "when used with various insulating layers of the extended cold weather clothing system." And I don't know this for a fact, but I assume those are EN/ISO extreme/survival ratings, not comfort or lower limit ratings.

    I never plan to go any where near -10 anyway. Just curious how low it would go comfortably. Low teens to single digits is my limit. And Im thinking the black bag by itself should handle that.


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    "I may not have gone where I intended to go, but I think I have ended up where I needed to be." Douglas Adams

  6. #6
    kamileon's Avatar
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    Quote Originally Posted by TxAggie View Post
    Ive had the black one on its own down to the single digits. Ive never been out any colder than that so I cant vouch for how much extra you get with doubling them up.

    I do know you need a pretty sizable pack to fit the two layered together.


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    I only plan to carry to the black bag by itself and really only when car camping. Definitely not backpacking item.


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    "I may not have gone where I intended to go, but I think I have ended up where I needed to be." Douglas Adams

  7. #7
    kamileon's Avatar
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    Quote Originally Posted by Black View Post
    Stayed warm at -7 using the entire system on my deck with two closed cell pads underneath. Napped off and on for 3 hours. Condensation from breathing got the best of me and I retreated to the house. I found that it was easy to over heat when using the green and black bags inside the bivy.
    Thats good to know. Thank you.


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    "I may not have gone where I intended to go, but I think I have ended up where I needed to be." Douglas Adams

  8. #8
    Senior Member Flash Grundelore's Avatar
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    Don't know about the whole system, but I remember being disappointed in how heavy just the bivy was [this was even before I found out about hammocking and down quilts]
    >> Onward thru the fog...>>
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