Synthetic or Down bag?

AZ_Hunter_2000

Senior Member
Joined
Oct 8, 2019
Messages
1,097
Since you are new, welcome to the forums.

There are tons of discussions about this very topic. They can easily be found using the Search function.

You may want to read them and then if you have any additional questions, then ask them.
 

Jalenweyker

Senior Member
Joined
Apr 4, 2019
Messages
309
Location
WI
When i made the decision i kind of came to the conclusion that if your dumb or have less experience and have any chance at getting you or your bag wet synthetic is the safer optionsince it can dry you at and keep you warm regaurdless. but if your experienced and hunt dry places and know how to keep your stuff dry down might be a lighter and kind of warmer option. Im in the forst boat so i went synthetic with no regrets
 

wiiawiwb

Senior Member
Joined
Nov 12, 2016
Messages
765
Location
In the mountains
Buying a new bag, what’s everyone’s opinion on down vs synthetic?
I'll chirp in by saying in cold weather....I choose both. If I am going to be overnight when it is 20F or colder, I prefer to use two moderately-rated bags rather than one really-cold-rated bag. Why?

As your body produces moisture at night, it travels into your down bag. When it reaches the outer layer next to the cold air, it can cause the moisture in the down to freeze. Now you could be in trouble.

In contrast, I layer a synthetic bag on top of my down bag. As the moisture travels, it goes from the down to the synthetic bag and into it. When it reaches the cold air outside the synthetic bag, it may freeze as well. The difference is that synthetic material performs better than down in a wet/cold environment.

To calculate the insulating value of two bags, I think the formula is x = y-(70F-(70F-zF)/2). y=warmest rated bag and z equals to coldest rated bag. For example, if you have two bags, a 40F and a 20F bag, by combining you get a rating of 5F calculated as follows: x= 20F-(70F-40F/2) or x = 20F-15F or x=5F.
 

Kronos

Junior Member
Joined
May 7, 2019
Messages
31
Down… carry it in a waterproof stuff sack. Any moisture it might see inside a working tent it can handle.

Synthetic is big, heavy, bulky, and loses its insulation value over time.
 

zscott

Junior Member
Joined
Nov 8, 2019
Messages
10
Like others have said, Down. The only time I use my synthetic bags is car camping with the kids and dogs when I am looking for something that can handle the abuse. Otherwise, synthetic is too heavy and doesn't pack well.
 

ybeaudoin

Junior Member
Joined
Feb 21, 2020
Messages
11
Down, 900 fill with extra stuffing( if you are ordering made in usa and custom. The extra stuffing will take the humidity of the tent better for a couple of days on multi day back pack.

The compression of 900 fill is superior, so less space in the backpack and simply invest in a light weight, Dyneema drybag from Z pack and your sleeping bag will always be dry!
 

Chirogrow

Senior Member
Joined
Dec 23, 2018
Messages
128
I just took a versailite to alaska and was a little worried about the moisture from my bag hitting the tent but it did amazing. I love how much less space they take up in my pack as well
 
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