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  1. #1
    Senior Member Grinder's Avatar
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    Combined bag temperature rating

    I'd like to get some opinions on this.

    When you combine two bags (one inside the other) how much does the combined temperature rating go down?

    For instance is a 30 dereee bag inside a 30 degree bag equivalent to a 0 degree?


    Specifically, I have the GG lightweight bag that was discussed on this list a month or so back (50 degree rating, I think) .I also have an Eddie Bauer Bag liner (a poly blanket with zipper). Then there is the poncho liner I just bought (I slept comfortably with just it last night.-- low of around 60 degrees)

    What temp could I be comfy at with combos of those three items??

    I'm still playing with gear to optimize overall bulk for a given temperature.

    When I win the lottery, I'll buy down and be done with it, but until then--- the dance goes on.

    Miles of Smiles
    Tom

  2. #2
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    Lot depends on how well they go together... if one restricts the other from full loft then you won't get a lot of gain...

    First estimate take the send bag reating subtract it from 70, devide that number by two and then subtract it from the first bag rate for a combined value ex

    Two 40 degre bags... 70-40 =30 devided by 2 =15 subtracted from other bag 40-15=25 for a first cut estimate of the combined bags... it may actually be better but probably not worse, so this works as a good conservative estimator, IMHO.

    Pan
    Ounces to Grams.

    www.jacksrbetter.com ... Largest supplier of camping quilts and under quilts...Home of the Original Nest Under Quilt, and Bear Mountain Bridge Hammock. 800 595 0413

  3. #3
    Senior Member Grinder's Avatar
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    Thanks Pan,

    That's just what I was looking for.

    I have a weekend outing in North Florida coming up. With my 50 degree bag and a baag liner I should be good to 40, which is around the worst case low. I'll have the poncho liner in reserve.

    Tom

  4. #4
    Senior Member stoikurt's Avatar
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    Quote Originally Posted by teblum View Post
    Thanks Pan,

    That's just what I was looking for.

    I have a weekend outing in North Florida coming up. With my 50 degree bag and a baag liner I should be good to 40, which is around the worst case low. I'll have the poncho liner in reserve.

    Tom
    Where in North Florida?
    Stoikurt
    "Work to Live...Don't Live to Work!"

  5. #5
    Senior Member Grinder's Avatar
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    north florida

    We were going to go camp on the beach in the big bend area. Possibly as for north/ west as Destin.

    My buddy came by today to tell me the trip is off. He has a conflict.

    I hate it when they do that!!

    Tom

  6. #6
    Senior Member FanaticFringer's Avatar
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    Funny I was thinking earlier about what temp my 2 Guide Gear 50 degree bags would be rated together. I was guessing 30. It looks like it is closer to 40.
    "Every day above ground is a good day"

  7. #7
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    FF,

    hey.. it may be good to 30... I just took a swag at a first cut estimating formula that, if off, would be off on the conservative side...

    Pan
    Ounces to Grams.

    www.jacksrbetter.com ... Largest supplier of camping quilts and under quilts...Home of the Original Nest Under Quilt, and Bear Mountain Bridge Hammock. 800 595 0413

  8. #8
    Senior Member FanaticFringer's Avatar
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    You might be right about that. I have used both bags with a low temp of 40. I was warm and felt I could have gone down further. Reason for using these bags insted of my Sniveler is my nephew was borrowing my Nest and my Sniveler was my underquilt.
    Last edited by FanaticFringer; 11-30-2006 at 18:30.
    "Every day above ground is a good day"

  9. #9
    Senior Member Grinder's Avatar
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    The Guide Gear UL bag feels warmer faster than anything I've ever tried. (I'm a down virgin)

    I wouldn't be suprised if two equaled near 30. A flannnel bag liner is supposed to be worth 10 degrees.

    Tom

  10. #10
    Senior Member FanaticFringer's Avatar
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    At around 1 lbs. 5 oz. each plus compression sack and around $20 (on sale)
    it is pretty nice.
    Last edited by FanaticFringer; 11-30-2006 at 18:35.
    "Every day above ground is a good day"

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