Find Your Store
Home Page

Cart, contains 0 items

When autocomplete results are available use up and down arrows to review and enter to select. Touch device users, explore by touch or with swipe gestures.
Expert Help
Earn Rewards

NEMO Equipment Inc.
Sonic 0 Sleeping Bag: 0F Down

3.8 out of 5 stars
5 Reviews

Out of Stock

Don't worry though, we have a lot more Down Sleeping Bags in stock than that.

Shop Similar Products

Why We Like The NEMO Sonic 0 Sleeping Bag

NEMO Equipment's Sonic 0 Down Sleeping Bag is our top choice for everything from hut trips in Colorado and Utah to winter camping in Montana. It performs well when temps dip down to single digits, and it's designed with a venting system that's a rarity in its class. Thermo Gill vents along the torso open up if things get too warm in our tent or hut, but this sleeping bag doesn't let any cold seep in if we forget to close them before shutting our eyes for the night. NEMO also uses 800-fill, RDS-certified, hydrophobic down, which makes for a light and compressible— and highly warm—bag.


  • Cold weather sleeping bag for winter excursions
  • Lightweight and durable shell made from responsible recycled materials
  • RDS-certified 800-fill down has a high warmth-to-weight ratio
  • Thermo Gill vents dump heat for better temperature regulation
  • Mummy shape optimizes warmth without adding weight
  • Waterproof and breathable Toester footbox with synthetic insulation for warmth and moisture-management
  • Item #NEMK02T
Responsible Collection
Recycled/Repurposed, Bluesign Approved, Responsibly Sourced
100% recycled nylon
800-fill down (RDS-certified), PFAS-free hydrophobic treatment, [footbox] synthetic
left, full-length
Max User Height
[short] 5ft 6in, [regular] 6ft, [long] 6ft 6in
Shoulder Circumference
[short] 61in, [regular] 63in, [long] 65in
Hip Circumference
[short] 56in, [regular] 58in, [long] 60in
Foot Circumference
[short] 51in, [regular] 53in, [long] 55in
Bag Length
[short] 72in, [regular] 78in, [long] 84in
Draft Tube
draft collar, draft tubes
Pad Retainer
Thermo Gill
Fill Weight
[short] 1lb 11oz, [regular] 1lb 12oz, [long] 1lb 13oz
European Norm/ISO Comfort Rating
European Norm/ISO Lower Limit Rating
Storage Sack
mesh storage back included
Stuff Sack
compression sack included
Stuff Size
[short] 13 x 9.5in (8.9L), [regular] 13 x 9.5in (9.6L), [long] 14 x 8.5in (9.9L)
Claimed Weight
[short] 3lb 2oz, [regular] 3lb 4oz, [long] 3lb 9oz
camping, winter camping
Manufacturer Warranty
limited lifetime

Overall Rating

4 based on 5 ratings

Review Summary

1 Stars - 1 reviews
2 Stars - 0 reviews
3 Stars - 1 reviews
4 Stars - 0 reviews
5 Stars - 3 reviews

Fits Slightly Small

Screen reader users: the following list provides a visual scale to illustrate the product fit. Please refer to the heading above for the fit type in text.
Runs smallTrue to sizeRuns large

What do you think about this product?


Selecting an option will reload the available reviews on the page
3 out of 5 stars

February 4, 2024

Meh Performance at 0 Degrees

I've used it several times
Size Bought:

The Nemo Sonic 0 Degree Sleeping Bag is a neutral performer. While the Nemo Sonic 0 Degree Sleeping Bag has awesome features and the best draft tube I have ever tested, it still did was not in the top percentile of all the sleeping bags I have tested. Using USDA certified thermometers, it only got up to 79 degrees on the inside of the bag. When compared to Therm-A-Rest Parsec, Feathered Friends Ibis ES and Mountain Hardware Bishop Pass GoreTex, it was well below those bags 82+ degree performances. Budget or expensive, it was just meh in terms of warmth performance. With all that being said, the Nemo Sonic 0 Degree Sleeping Bag would most likely work well from 10 degrees up to 40 degrees since it has the venting option. But I would not take it below 10 degrees. Also, if you are 5'11" or above, do not get the regular. I am 6' and it was short for me, causing my feet to be cold at 8 degrees.

CaptainBerz C
5 out of 5 stars

October 12, 2023

Fall in Alaska

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 reviewed on

5 out of 5 stars

November 18, 2022

Outstanding sleeping bag

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.


Originally reviewed on

5 out of 5 stars

June 28, 2022

I like everything about this bag

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


Originally reviewed on

1 out of 5 stars

March 15, 2022

This is not a 0 degree bag.

I've used it once or twice and have initial impressions
Size Bought:

Do not take this out for anything less than 30F. You will be cold. There?s no way this is a lower limit of 0F. Lower limit of 15, maybe, and I?d imagine I would be shivering. This is a 30F bag all day every day. The baffles are 2.5? thick. Something is seriously wrong with these bags.

Michael M