Big agnes sleep system was cold

doc holiday13

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Frequently repeated myth.

So I looked this up a little bit and I can almost see why people would believe it.. Basically if you bundle up so much that you're sweating buckets, you'll have excessive moisture buildup inside the bag and that does make you cold. But you'd need to be wearing a down jacket and down pants to get yourself sweating that bad and/or you're sleeping bag is rated for much lower than the temps you're using it in.
 

307

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So I looked this up a little bit and I can almost see why people would believe it.. Basically if you bundle up so much that you're sweating buckets, you'll have excessive moisture buildup inside the bag and that does make you cold. But you'd need to be wearing a down jacket and down pants to get yourself sweating that bad and/or you're sleeping bag is rated for much lower than the temps you're using it in.
The other potential reason would be compression of the down from the inside, basically taking up too much volume inside the bag and compressing the loft.

But mostly, I've used the myth to get significant others naked in the tent...

So, while mostly a myth, it can certainly be useful.
 

Tequatche

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Looking into the x therm large, there are not a lot in stock right now. I would like the regular wide if I could find that 1. Thanks for all the input though.

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That's what I use. Great pad, taken it down to just below zero.
 

Poser

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Frequently repeated myth.

I feel like this is something that was permeated by the Boy Scouts for years and I am surprised by how often it is repeated as gospel. If sleeping layers made you cold, then layering underneath your down puffy would also make you cold. If you apply an ounce of logic to this, the idea that sleeping in clothes makes you colder, the notion instantly falls apart. If that’s not enough, the world’s best and most hardcore alpinists, mountaineers and artic explorers have been skimming on sleeping bag insulation for years and relying on their clothing layers to shave weight and you’d likely find the same is true for all experienced high altitude and cold weather adventurists, military and native peoples.
 

AK Troutbum

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The other potential reason would be compression of the down from the inside, basically taking up too much volume inside the bag and compressing the loft.

This is the exact reason that some of the better quilts have a differential construction design.


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Alaska_Joe

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The thermarest neoair xtherm max is perfect for the big Agnes bags. The reflective baffles in that thing are amazing, I can literally feel my body heat reflected back on me when I lay down on it. Lightest, smallest packing, warmest pad out there. Also, think about a vapor barrier liner (either bag liner or top/bottoms) to keep your bag dry. VBL’s add a good amount of warmth and let you regulate your temp a lot more effectively.
 

Zach Herold

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The same 30* degrees, I also sleep hot. I have never noticed the actually pad being cold before when I have had a full sleeping bag under me. I got hot while sleeping in this and had to unzip to get some cool air in. It was just the pad that felt cold on my side as I'm a side sleeper. I loved the sleeve being connected to the pad for sure.

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So is it a bottomless bag as the sleeping pad fits inside the sleeve? Or does the bag have a bottom and a sleeve?

I ask because I have the big agnes mystic 15 degree bag and it has a sleeve to put the pad in. The bag itself does not have any insulation on the bottom with the idea being that the pad inside the sleeve is enough. Is this like your bag?
 
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Cliffy12

Cliffy12

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So is it a bottomless bag as the sleeping pad fits inside the sleeve? Or does the bag have a bottom and a sleeve?

I ask because I have the big agnes mystic 15 degree bag and it has a sleeve to put the pad in. The bag itself does not have any insulation on the bottom with the idea being that the pad inside the sleeve is enough. Is this like your bag?

It has the sleeve built into the bottom of the bag and there is only the fabric between you and the pad. No insulation. It is the same as the mystic. The Thermarest pad was the trick. 15 days during September wasn't cold any night sleeping on that.

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Zach Herold

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It has the sleeve built into the bottom of the bag and there is only the fabric between you and the pad. No insulation. It is the same as the mystic. The Thermarest pad was the trick. 15 days during September wasn't cold any night sleeping on that.

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Copy. If I'm understanding your issue correctly, I think I've had that happen to me also. Sometimes my pad will be cold to the touch especially if I am not laying on a portion of the pad and then move and start laying on that portion. I most notice this when the temps get really cold. I sleep on my back, so unlike a side sleeper, my heat is dispersed along the top of the pad to make more of the pad be warm. But what I did to mitigate feeling the cold pad is sleep with my clothes on and usually unless its really cold, I will just unzip the bag completely. In my experience when I move around and touch new portions of the pad my clothes will help it not feel as cold until my body heat warms it up and having the zipper unzipped allows me to regulate the overall temp in the bag really well.
 

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