SKU: 598678379

Nemo Sonic -20F/-29C Sleeping Bag

Sale price$396.00 Regular price$440.00
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Description

Nemo Sonic -20F/-29C Sleeping BagThe ultimate mountain sleeping bag Built to be the only bag you need from 20F to 40F, Nemo has updated their Backpacker Editors Choice award winning big mountain bag, Sonic, for even greater warmth, tuneability, and reduced environmental impact. With this bag, we are launching our next generation Thermo Gills with a new multistage zipper system that dramatically increases the usable temperature range of the bag and allows fine tuning of comfort from

The ultimate mountain sleeping bag

Built to be the only bag you need from -20°F to 40°F, Nemo has updated their Backpacker Editors’ Choice award-winning big-mountain bag, Sonic, for even greater warmth, tuneability, and reduced environmental impact.

With this bag, we are launching our next-generation Thermo Gills™ with a new multistage zipper system that dramatically increases the usable temperature range of the bag and allows fine-tuning of comfort from within the bag. Sonic’s new chevron baffle construction better compartmentalizes down, eliminating migration and keeping the down evenly lofted. Not to mention, it looks awesome. In updating the bag's design, we put a high priority on taking a leap forward in sustainability.

The shell and liner fabrics are 100% recycled and bluesign® approved. The premium 800 FP hydrophobic down is 100% Responsible Down Standard (RDS) certified. We also took years of history in the field to make detailed upgrades, including massaging the profile of the bag, redesigning the draft collar, and bolstering the draft tubes. Our proven Toester™ footbox keeps feet warmer, provides a waterproof barrier against tent wall condensation, and protects down from moisture while drying damp clothes inside the footbox. Adaptable to whatever the mountain throws at it, Sonic continues to reverberate as the ultimate extreme weather companion.

Details

  • Award-winning design is updated for even greater warmth retention and adjustability across temperatures.
  • Updated design incorporates 100% recycled, bluesign® approved shell and liner fabrics.
  • Updated Thermo Gills™ extend the comfort range with a new multistage zipper system.
  • Overstuffed with premium 800 FP hydrophobic down that is PFC-Free and 100% Responsible Down Standard (RDS) certified, ensuring humane treatment and traceability throughout the supply chain.
  • New chevron baffle construction better compartmentalizes down for more uniform loft and down migration prevention.
  • Stretch construction at the knees for comfortable side sleeping.
  • Redesigned draft collar and draft tubes keep cold air out.
  •  Redesigned Toester™ waterproof/breathable footbox utilizes a layer of synthetic insulation to protect the down and deliver maximum toastiness for toes.
  • Offset zipper creates a thermally efficient seal while an updated profile secures warmth closer to the body.
  • Protected by the NEMO Lifetime Warranty.

 

    What's Included

    • Compression stuff sack   

      Best Use

      • Winter Camping
      • Mountaineering

      Construction & Materials

      Shell Fabric 20D 100% Recycled Nylon, Bluesign Certified Ripstop w/ DWR
      Footbox Fabric 40D 100% Recycled Nylon, Bluesign Certified Ripstop W/B w/ DWR
      Lining Fabric 20D 100% Recycled Polyester, Bluesign Certified Taffeta w/ DWR
      Color Goodnight Gray / Torch
      Zipper Location Left
      Stuff Sack Compression stuff sack
      Insulation 800 FP Down


      Specs & Sizing

      Capacity 1
      Minimum Weight 3 lb , 14 oz / 1.76 kg
      Packed Size 14.5 x 10.5 in dia / 37 x 27 cm dia
      Temp Rating -20F / -29C
      ISO Lower Limit F / C
      Fill Type Down
      Fill Weight 2 lb , 5 oz / 1.06 kg
      Fits Up To 6' / 183 cm
      Shoulder Girth 63 in / 160 cm
      Hip Girth 58 in / 147 cm
      Knee Girth 53 in / 135 cm
      Compressed Volume 12.5
      Shipping Notes
      • Free Standard Shipping on $100+ Orders to the USA.
      • Except Preorder products are shipped in 48 hours.
      • Delivery to the USA:
      1. Standard Shipping : 3-10 business days
      • If time is of the essence, please consider selecting expedited delivery for faster service.
      Exchange/Return Notes
      • We offer a 30-day return/exchange service after receiving.
      • Final sale items are not eligible for returns or exchanges.
      • To process your return/exchange, please contact us at [email protected]
      • Please click here for more details>>> Return & Exchange Policy
      SKU: 598678379

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      4.4 ★★★★★
      Based on 941 reviews
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      Heather Geschwentner
      Charlottesville, US
      ★★★★★ 5
      Tough
      Size: X-Large (Pack of 1), Product Packaging: Standard Packaging
      Nice and tough. Good, large size to put lots of treats and goodies to freeze for long interactive experience enjoyment.
      WAS THIS REVIEW HELPFUL?YesReportShare
      Reviewed in the United States on June 9, 2026
      C
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      Cakebaker
      Pawtucket, US
      ★★★★★ 4
      Helps with separation anxiety, keeps dogs busy
      Size: Medium (Pack of 1), Product Packaging: Standard Packaging
      Have been using kongs for my labs for years. Brand new the kongs do have a strong rubber smell. Try putting the Kong in a pot with water over low fire to help reduce the smell. Stuff with favorite treats or fill with peanut butter and freeze. Will keep dogs busy and chewers with an indestructible toy
      WAS THIS REVIEW HELPFUL?YesReportShare
      Reviewed in the United States on March 17, 2026
      S
      Verified Purchase
      Susan D. McCarthy
      Massapequa, US
      ★★★★★ 5
      Very durable and my Dutchie loves it
      Size: X-Large (Pack of 1), Product Packaging: Standard Packaging
      This is one of many Kongs I have purchased through the years. This one was the extra large that was purchased for my Dutch Shepherd. Every night at bedtime, he gets his Kong stuffed with some dry food, treats, and a nubs bone to hold everything in place. He loves his Kong and runs for his crate at bedtime. Usually, he doesn’t eat the treats immediately. But sometime during the middle of the night, he will wake up and eat. Every Kong I have purchased through the years has been very durable. I highly recommend this product for all sizes of dogs.
      WAS THIS REVIEW HELPFUL?YesReportShare
      Reviewed in the United States on May 22, 2026
      C
      Verified Purchase
      charlie
      Birmingham, US
      ★★★★★ 5
      Best chew toy and training item on the market!
      Size: Small (Pack of 1), Product Packaging: Standard Packaging
      I'm a Dog Trainer, specializing in early canine education with Puppies between eight and 18 weeks . The Kong is the best thing you can give a dog! You can stuff these things with all kinds of yummy things. I love to get creative with the Kongs. Adding novelty to your dog's life improves their brain health. I can't even give examples because I would be here all day. For dogs who eat kibble you can soak your kibble in water or better yet bone broth, then once it's soft, fill the kong with the kibble and put it in your freezer. Keeps your dog busy for a long time, you don't have to buy extra stuff because you just give them the kibble you're already going to give them. (I recommend getting at least one, but up to six for each dog so you can give them their entire daily allowance of food in the Kongs). The licking /chewing helps them relieve stress and gives them something to enjoy inside their crate. I learned this from Dr. Ian Dunbar and I highly recommend his training courses on a platform called Dunbar Academy to learn how to properly raise a Puppy into the best dog you've ever had. He has helpful information for older dogs too, but you really want to train your puppy properly so you can avoid the behavior problems in the first place. It's super cheap too, and easy to learn from. Plus these are great chew toys for heavy chewers because as long as you get the right size for your dog, they can't destroy this thing! AND it bounces, so you can actually play fetch with it like it's a ball. Every single dog deserves a Kong, so if you don't already have one, go ahead and do that right now. You won't regret it, and your dog definitely will love you more.
      WAS THIS REVIEW HELPFUL?YesReportShare
      Reviewed in the United States on December 29, 2025
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      Verified Purchase
      Brad
      Charlottesville, US
      ★★★★★ 5
      My pup loves her Kong
      Size: Small (Pack of 1), Product Packaging: Standard Packaging, Size: Small (Pack of 1), Product Packaging: Standard Packaging
      My little pup loves her Kong! She’s about 14 pounds so I recommend any dog with that size to get the small size. The quality is great. Extremely durable, but still workable enough for her to get in and find all the goodness!
      WAS THIS REVIEW HELPFUL?YesReportShare
      Reviewed in the United States on May 27, 2026

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