Sleeping bag in the works. Temp Rating?

[TOLeary]

Been working on a new down sleeping bag. To all you folks that go in deep and lean.....toward weight conscious or minimalist, what do you prefer for temperature rating? Sorry to discriminate!

So far I've got prototypes in 30 and 15 degree, but I'd love to know if I should shift one way or the other.

Any idea on the features yet? Only wondering because I’d aim for a lower temp rating (20) if the bag can be opened up for slightly warmer weather but still be used in colder weather if synched up. 30 if more of a traditional zippered bag with hood

 

[Turkeygetpwnd38]

20 degree

 

[il_cop]

@Brigham @ Outdoor Vitals

Go to market with both and you'll have every season covered!

15* that's roomy enough to layer will take me through rifle season in Colorado, if it's slim, I need a 10* at least.

30* is perfect for archery season

 

[MountainTracker]

20 degree is about perfect for me, if going to be colder I’ll bring my synthetic 50 degree quilt to layer over.


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[Tahoe1305]

I concur with 20d comfort rating. In a 6’ ish bag this should be close to 22oz of 850-900 down.

I’d be interested as well. Been looking at 10-15d bags recently (guessing lower limit rating) and they all have about that level of fill. The best bags are right at 2lbs.

 

[Brigham @ Outdoor Vitals]

@Brigham @ Outdoor Vitals

Go to market with both and you'll have every season covered!

15* that's roomy enough to layer will take me through rifle season in Colorado, if it's slim, I need a 10* at least.

30* is perfect for archery season

Good chance this is where we end up.

This new bag will definitely be roomy. I'll go into a lot more detail down the road, but under 2 lbs. with a lot of room are a couple of key elements in the design intent of this bag.

 

[jzeblaz]

Been working on a new down sleeping bag. To all you folks that go in deep and lean.....toward weight conscious or minimalist, what do you prefer for temperature rating? Sorry to discriminate!

So far I've got prototypes in 30 and 15 degree, but I'd love to know if I should shift one way or the other.

My early season light and lean is a 40 degree bag. Been thinking about a quilt as that is probably the way for that hunt and the bag is nearing the end of its service life.

 

[Deadspace]

Good chance this is where we end up.

This new bag will definitely be roomy. I'll go into a lot more detail down the road, but under 2 lbs. with a lot of room are a couple of key elements in the design intent of this bag.

I hope you do. A 15 and a 30 would be great.

 

[shax2lex]

Here’s a novel idea, add loops to the bottom edge on the each side so the bag can be strapped to the sleeping pad like quilts with bungee cord. I love my sleeping bag. I hate it sliding off the pad. I mean the loops can’t be much of an ask.

 

[mxgsfmdpx]

Another note and I know it’s heading into the weeds a bit.

But WMs “semi rec” cut is the absolute way for stomach and side sleepers. I will not purchase a “mummy” shape no matter the other features.

 

[svivian]

Another note and I know it’s heading into the weeds a bit.

But WMs “semi rec” cut is the absolute way for stomach and side sleepers. I will not purchase a “mummy” shape no matter the other features.

Agreed, if the comfort rating requires me to be wrapped like an over stuffed chipotle burrito I’m out

 

[passinggas33]

Long winded idea here…but hear me out. What if you could make a semi rectangular cut bag (like a WM) with a sleeping bag sleeve built into it (like the big Agnes) and a small layer of synthetic insulation on the top half of the sleeve system (where you would lay). Then have a nice down bag with a zip down each side that could be unzipped and turned into a quilt. And then keep it around 3 pounds for all of those features and have it be a 20 degree bag? Am I crazy in wanting all of these features in one “bag system”?

 

[camelcluch]

I’m a cold sleeper so 15 or I would really prefer a 10.

 

[lifeisgoodsteve]

@Brigham @ Outdoor Vitals

Go to market with both and you'll have every season covered!

15* that's roomy enough to layer will take me through rifle season in Colorado, if it's slim, I need a 10* at least.

30* is perfect for archery season

I'd generally agree with this, unless you just want to come out with a single all purpose bag.

For me a 20 degree bag is just too hot during the summer and most of september. Maybe it's me, but when I open it up there's the extreme heat of the heavy bag then cold of no bag, so it really effects my sleep in those times.

I'm literally going to buy a 30 degree bag for summer/Sept and have my 20 degree bag overfilled for colder weather.

 

[sneaky]

Long winded idea here…but hear me out. What if you could make a semi rectangular cut bag (like a WM) with a sleeping bag sleeve built into it (like the big Agnes) and a small layer of synthetic insulation on the top half of the sleeve system (where you would lay). Then have a nice down bag with a zip down each side that could be unzipped and turned into a quilt. And then keep it around 3 pounds for all of those features and have it be a 20 degree bag? Am I crazy in wanting all of these features in one “bag system”?

I've seen a bag that does all that already on the market. Can't remember which manufacturer it is though, but there's one out there.

 

[tap_city]

I'd go with a 30 and layer if needed. Too small of a foot box is a deal break for me after spending several says in quilt with a non-existent foot box.

 

[Brigham @ Outdoor Vitals]

We're definitely leaning toward 2 models at this point. A 30 degree and 15 degree. I'm one of the guys that doesn't mind sleeping in puffy layers when it is cold enough, and I like the weight savings of a 30 deg. The 15 degree is a solid rating for the guys/gals that avoid sleeping in puffy layers as much as possible.

On the design, we're going for really simple and easy to use without complication or thought. We want as few operations as possible to get into it and sleep. And roomy. It's not rectangular. It's tapered a little but not like a mummy, so below the knees there is a lot of room.

 

[Tmcgarrigle]

Agreed with others. 15-20F comfort rating with a collar is the sweet spot

 

[cuerro viejo]

Wide hip and shoulder w/ comfort 30 that’s very light, 850 down and under $300.

 

[Oakman]

My main hunt is in the fall, when temps drop to 20–30°F at night, it’s important to remember that sleeping bag ratings are lab-tested and usually reflect the survival or lower limit. A bag rated at 10°F often has a comfort rating closer to 20°F (Please correct me if I am wrong)
Personally, I go by the comfort rating rather than the generic temperature rating it’s a lot more realistic for staying warm through the night without layering up too much.