How to Choose Sleeping Bags for Backpacking
NEMOÂ Sonic 0 Sleeping Bag
$549.95 – to $649.95
Built to be the only bag you need for a wide range of temps, the Nemo Sonic 0 sleeping bag offers greater warmth, more tuneability and a reduced environmental impact compared to past versions.
Key Details
Fill
800-fill-power down
Weight
Small - Left Zip: 3 lbs. 2 oz.
Long - Left Zip: 3 lbs. 9 oz.
Compressed Volume
Small - Left Zip: 8.9 liters
Long - Left Zip: 9.9 liters
Temperature Rating (F)
0 degrees (F)
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- Chevron baffle construction better compartmentalizes down, eliminating migration and keeping the down evenly lofted
- Shell and liner fabrics are 100% recycled to the Global Recycled Standard (GRS) and are bluesign® approved
- Premium 800-fill-power hydrophobic down is 100% Responsible Down Standard (RDS) certified and PFC-free
- Redesigned draft collar and draft tubes keep cold air out
- Offset main zipper creates a thermally efficient seal while an updated profile secures warmth closer to the body
- Updated Thermo Gills™ extend the comfort range for milder nights with a multi-stage zipper system that lets heat out without letting cold drafts in
- Stretch construction at the knees adds comfort for side sleeping
- Redesigned Toester™ waterproof/breathable footbox utilizes a layer of synthetic insulation to protect the down and deliver maximum toastiness for toes
- Toester footbox also provides a waterproof barrier against tent wall condensation; you can even dry damp clothes inside the footbox
- Protected by the NEMO Lifetime Warranty
Imported.
Temperature ratings are intended as a guideline to help you compare products, rather than a guarantee of warmth, since many different factors contribute to your comfort while you sleep. Backpacking bags are typically rated for temperature according to an independent testing protocol—currently International Organization for Standardization (ISO) 23537, though some older items followed European Norm (EN) 13537. Testing is based on a person wearing one base layer and a pair of socks, sleeping on an insulated surface with a minimum R-value of 5.38.
Each bag then gets 2 ratings: the Comfort rating is the lowest temperature at which the bag will keep the average "cold sleeper" comfortable, and the Lower Limit rating is the lowest temperature at which the bag will keep the average "warm sleeper" comfortable. Some brands determine their own temperature rating by aligning to the Comfort rating for women’s bags, to the Lower Limit rating for men’s bags, or somewhere in the middle for nongendered bags.
View all NEMO Backpacking Sleeping BagsEach bag then gets 2 ratings: the Comfort rating is the lowest temperature at which the bag will keep the average "cold sleeper" comfortable, and the Lower Limit rating is the lowest temperature at which the bag will keep the average "warm sleeper" comfortable. Some brands determine their own temperature rating by aligning to the Comfort rating for women’s bags, to the Lower Limit rating for men’s bags, or somewhere in the middle for nongendered bags.
| Best Use | Mountaineering |
|---|---|
| Tested Lower Limit | 0 degrees (F) - ISO |
| Tested Comfort | 14 degrees (F) - ISO |
| Temperature Rating (F) | 0 degrees (F) |
| Temperature Rating (C) | -18 degrees (C) |
| Weight | Small - Left Zip: 3 lbs. 2 oz. Long - Left Zip: 3 lbs. 9 oz. |
| Shell | Recycled nylon |
| Zipper Location | Left |
| Insulation Type | Down |
| Water-Resistant Down | Yes |
| Fill | 800-fill-power down |
| Fill Weight | Small - Left Zip: 1 lb. 11 oz. Long - Left Zip: 1 lb. 13 oz. |
| Lining | Recycled polyester |
| Sleeping Bag Shape | Mummy |
| Fits Up To (in.) | Small - Left Zip: 66 inches Long - Left Zip: 78 inches |
| Shoulder Girth (in.) | Small - Left Zip: 61 inches Long - Left Zip: 65 inches |
| Hip Girth (in.) | Small - Left Zip: 56 inches Long - Left Zip: 60 inches |
| Stuff Sack Size | Small - Left Zip: 9.5 x 13 inches Long - Left Zip: 9.5 x 14 inches |
| Stuff Sack Volume | Small - Left Zip: 14.9 liters Long - Left Zip: 16.3 liters |
| Compressed Volume | Small - Left Zip: 8.9 liters Long - Left Zip: 9.9 liters |
| Gender | Unisex |
| Sustainability | Product meets the bluesign® criteria |
Buying Advice
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Jeff
Cleveland, Ohio
2 trips to Nepal & wouldn’t use another bag
6 months ago
After two trips to Nepal, one to Everest Bade camp and the other 21 day trek around the Annapurna circuit, this sleeping bag was the envy of those whom I traveled with. Its ability to regulate its temperature insured that I could handle the temperature extremes of frigid weather to mild. It’s compression pack allowed it to go into my travel bag that the porter carried as opposed to having to be dealt with separately. But then that help regulate temperature really do work. I tend to run very warm so even when the room is 14°F, I sometimes need to cool myself down. This bag does just that.
Age:55–64
Weight:200–225 lbs.
Height:6'1"
Yes , I recommend this product
David
southern California
just perfect
2 months ago
For weather under 25*f, this is perfect. It is super fluffy. Love the side vents that can open if you get a bit too warm. Really like the wrap around my head better than other designs. Impressively light weight. Looks huge when I store it in the included storage bag to maintain fluff factor, but very small when you squeeze it down in the included cinch compression bag. Very good price on REI Online for a bag of this quality. I’m starting the John Muir Trail early, in and out of snow for three weeks with this one.
Age:55–64
Weight:175–200 lbs.
Height:5'11"
Yes , I recommend this product
CodyC
Best 0 Degree Bag I've Owned!
11 months ago
I recently purchased the 0 degree bag for a bike-to-ski trip in Iceland, so I needed it to work in a variety of conditions (cold, wet, snowy, windy, you name it), and be versatile enough to pack into panniers, backpacks, and beyond. The bag was perfect and outperformed my expectations. I stayed warm on cold nights and loved the ability to open the gills for added breathability, which was crucial in never feeling too swampy if it was a warm night. I ended up swapping the stock stuff sack for a waterproof compression sack, and it packed down quite small for a 0 degree, fitting well into my panniers and 35L backpack when skiing. I'm 5'9" and the regular length fit me well - my pillow tucked very nice and snugly into the hood, so sleeping was always quite comfy and cozy. No complaints, issues, etc. Happy customer here!
Originally posted on nemoequipment.com
Killthelag
New York, NY
Quality sleeping bag.
1 year ago
Nemo means quality. This sleeping bag is very warm.
Age:25–34
Weight:125–150 lbs.
Height:5'7"
Yes , I recommend this product
Ken
Triangle VA.
Excellent bag
3 years ago
This bag works as advertised. I used it on my ride from Virginia to New Mexico and back. Several nights got into the mid to low 30's. No issue at all. I stayed completely warm.
Age:55–64
Weight:200–225 lbs.
Height:6'0"
Yes , I recommend this product
Jeff
First Impressions
3 months ago
This is a first impression as I have not had an opportunity to sleep outside with it yet. Using synthetic fill for the footbox area is a nice detail. The zippers on the venting "gills" are VERY small and even in brief testing, they sometimes catch on the fabric.
Originally posted on nemoequipment.com
Gizmo
Oregon
I like everything about this bag
3 years ago
Very warm, just the right amount of room for me, zipper works very well, thermal gills work great. I have been sleeping in bags for 60 years and this is my favorite
Yes , I recommend this product
Originally posted on nemoequipment.com
Oehlert
Fall in Alaska
1 year ago
Worked perfectly for a fall bear hunt in Alaska. I am 6’1” and purchased the XL and in was nice with a little length to spare.
Originally posted on nemoequipment.com
Anonymous
3 years ago
Originally posted on nemoequipment.com
Martin
Southwest Colorado
Outstanding sleeping bag
2 years ago
I bought this in time for my 4 day solo backcountry hunt. Temperatures were projected to be in the mid teens at night, but a cold snap occurred and dropped down to single digits (Fahrenheit). This bag saved my trip. It was so warm that I was able to sleep in my boxers. I'm 6'2" tall and 230 pounds. The long bag allowed for plenty of space to move freely. My size 14 feet didn't feel cramped in the toe box. Condensation in the morning was easily brushed off with a towel in the morning and the bag always dried quickly. I don't think the insulation ever got wet. The baffle cinches with an elastic cord and traps in the heat. The gills did a great job of regulating heat. I think it packs down to a reasonable size with the stuff sack, and I think the stuff sack was well-matched. I don't believe I could have compressed the bag much more. There's a pocket near the zipper, just below the face opening. This fit my Iphone 12 mini, but I don't think it would fit anything much larger. I have suggestions for the design in the future. Because of the wallet/phone pocket's location, in the morning, it was usually covered with condensation. This made trying to open the pocket only slightly more difficult, but was still annoying to deal with the cold and damp. It's also not accessible unless I were to open the main zipper and let out heat. I'd prefer a pouch, interior to the bag. This way it's insulated from freezing temperatures. The baffle velcro could be a bit stronger too, or designed to sandwich between flaps for better purchase. But these are very minor issues. What matters most is that the bag is warm, roomy, dry, and of a reasonable weight and pack size. Having this bag has opened up so many more opportunities for cold weather outtings that I cannot wait to explore.
Yes , I recommend this product
Originally posted on nemoequipment.com