# Combined bag temperature rating

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• 11-30-2006, 07:21
Grinder
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
• 11-30-2006, 09:25
Peter_pan
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
• 11-30-2006, 09:42
Grinder
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
• 11-30-2006, 14:16
stoikurt
Quote:

Originally Posted by teblum
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?
• 11-30-2006, 16:46
Grinder
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
• 11-30-2006, 17:00
FanaticFringer
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.
• 11-30-2006, 18:06
Peter_pan
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
• 11-30-2006, 18:12
FanaticFringer
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.
• 11-30-2006, 18:26
Grinder
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
• 11-30-2006, 18:33
FanaticFringer
At around 1 lbs. 5 oz. each plus compression sack and around \$20 (on sale)
it is pretty nice.
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