
NEMO
Disco 15 Series
Spacious for side sleepers; bulky, temp rating optimistic.

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For cheap, no. https://preview.redd.it/crlfe5zr9u1g1.jpeg?width=447&format=pjpg&auto=webp&s=528fa1c294cba5226b5f77d7a984a5ee5ee7ce1b Though, a system bag like the [Big Agnes Lost Ranger 3n1 0](https://www.rei.com/product/245987/big-agnes-lost-ranger-3n1-0-sleeping-bag) will get you awful close if you add the [Outdoor Research Helium Bivy](https://www.rei.com/product/203558/outdoor-research-helium-bivy). This is what I use. You could also build a similar system that is a bit safer from a 40 degree top quilt like the [Enlightened Equipment Revelation Apex Regular-Wide](https://enlightenedequipment.com/revelation-apex/) and any 20 degree Down mummy bag like [Mammut Comfort Down 23](https://www.rei.com/product/247720/mammut-comfort-down-23-5c-sleeping-bag)
Well in the Big Agnes system, the quilt is mostly for warmer weather, where that is less of an issue. Also, what isn’t obvious from quilts is that they actually deal with tossing better than folks expect. The key is that to “Collar” is oversized like a big draft collar on a traditional sleeping bag. Quilts like the Zen Bivy, and the above bag completely negate the issue of drafts coming in the side by by zipping or climbing the sides down. This makes means drafts can only come in the top. Cinch them up before bed and don’t worry. I bought the old UL version back when they offered a 800 fill power version. Kept the whole system below 3lbs. Dicks sporting goods still has 2 in stock [here for $470](https://www.dickssportinggoods.com/p/big-agnes-lost-ranger-ul-3n1-0-sleeping-bag-23tumalstrngrl3n1csl/23tumalstrngrl3n1csl)
Big Agnes Lost Ranger 0F Sleeping Bag and Pad. I can adjust accordingly with this bag because its two bags in one really. You specified camping and this is a great camping bag. I got it cheap a couple of springs ago. I like it.
Baselayers!!! Midlayers!! Outerlayer! Wool socks. Baselayer as a Dry suit for sleeping Thermal Sleeping pad. Big Agnes Lost Ranger 0F Sleeping Bag $$ you are going to spend some cash money. It's like crack.
I think going all in like this is a bit much personally, but I do have a zenbivy sheet and quilt, and I found that for the specs etc. the value wasn't awful when I purchased, at least for backpacking equipment factoring in weight etc. For moto camping alone, it's a bit overkill. Breaking it down a bit: I think the pillow looks a bit overpriced, but if it's super good maybe not awful. The mattress also looks a bit overpriced to me - compared to a similar Nemo or Big Agnes. The dry sack is overpriced IMO, and not really necessary unless you don't have waterproof luggage. I just pack my quilt in wherever it'll fit to take up all the extra space. The quilt itself I think is pretty solid, 10° is pretty cold but maybe makes sense depending on where you're located, and the integration with the sheet is super nice IMO. The Big Agnes lone/lost ranger are competitive options that are priced generally similarly for context.
I think going all in like this is a bit much personally, but I do have a zenbivy sheet and quilt, and I found that for the specs etc. the value wasn't awful when I purchased, at least for backpacking equipment factoring in weight etc. For moto camping alone, it's a bit overkill. Breaking it down a bit: I think the pillow looks a bit overpriced, but if it's super good maybe not awful. The mattress also looks a bit overpriced to me - compared to a similar Nemo or Big Agnes. The dry sack is overpriced IMO, and not really necessary unless you don't have waterproof luggage. I just pack my quilt in wherever it'll fit to take up all the extra space. The quilt itself I think is pretty solid, 10° is pretty cold but maybe makes sense depending on where you're located, and the integration with the sheet is super nice IMO. The Big Agnes lone/lost ranger are competitive options that are priced generally similarly for context.
Kelly cosmic down bags are amazing bang for buck. REI has generous return policies as well, so if you get into a bag you don’t like, you have the option to return it for a year. More expensive bags/huge discounts don’t necessarily mean they are going to fit your needs. I currently sleep in the Big Agnes Lost Ranger, which is a 3in1 sleep setup. It is a quilt and a sleeping bag, which means you can sleep with just the quilt, just the bag, or if it’s cold enough you can nest the sleeping bag inside the quilt. It’s on the more expensive side, but it could be beneficial looking into a similar setup. I would however recommend investing in a nice sleeping pad that has a decent R value. I currently sleep on the Big Agnes Rapide SL Insulated (regular) and I LOVE IT. it comes in all different types of widths and lengths. I’ve slept on it for 2+ weeks in the Yosemite side country and I’ve never had a single issue with it. long story short, i’m a huge fan of the Kelty Cosmic Down line. there are also a few REI branded bags that may be worth looking at.
I'm in central Idaho. I use the Big Agnes Ranger 3-1 15 Degree bag for my elk season that runs late October into November. The double bag combo works well for keeping warm into the 10-20 degree overnight temps. I pair it with an inflatable pad with an R value of 4. A good warm pad makes the biggest difference for me. I'm not sure how you are, but if I don't get good sleep, my motivation tanks, especially as I get into the later days of my hunt. If you're not taking a hot tent you should get a bag that will keep you comfortable in freezing conditions.
I have a Big Agnes lost ranger UL which is a 2 part system, one of which is like you describe, the other a regular bag, or you combine both for maximum insulation.

NEMO
Disco 15 Series
Spacious for side sleepers; bulky, temp rating optimistic.
Hammock Gear
Classic Burrow 20°F
Budget king; very warm but heavier than ultralight.

NEMO
Disco 30
Spoon shape for side sleepers; prone to zipper issues.

Western Mountaineering
VersaLite
Durable, very warm; premium price, too hot in summer.

Katabatic Gear
Alsek 22°F Quilt
Versatile 3-season quilt; secure pad attachment, high price.

Ranked #1
NEMO - Disco 15 Series

Ranked #1
Kelty - Tru.Comfort Doublewide 20
Ranked #1
Enlightened Equipment - Revelation APEX

Ranked #1
NEMO - Disco 15 Series

Ranked #1
Feathered Friends - Egret UL 20/30

Ranked #1
NEMO - Disco 15 Series