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NEMO Sonic Down Sleeping Bag (-18C)

NEMO Sonic Down Sleeping Bag (-18C)
  • Size: Short
  • Size: Regular
  • Size: Long
Please select options


The Backpacker Editor’s Choice Award Winning Sonic™ has been praised as the only bag you really need from -20 to 40 degrees.

Now updated with a redesigned draft collar and draft tubes to create a secure seal against cold air; overstuffed 800FP hydrophobic, RDS certified down; and an updated profile and shaped footbox, the Sonic™ continues to rock out as the King of Comfort from basecamp to summit.

The contoured hood with drawstring cord creates maxiumum thermal efficiency, and stretch construction at the knees allows side sleeping. Toester™ footbox is tailored for foot comfort, waterproof/breathable, and includes a layer of synthetic insulation to reduce cold spots.

Weight (Reg): 1.36kg / 3.0lbs
Fill: 800 Fill Power Hydrophobic RDS Down
Fill Weight: 720 g / 1.56 lbs

Award-winning design allows for temperature regulation in variable mountain climates.

Adjustable Thermo Gills™ vent body heat at your core without letting cold air rush in.

Stretch construction at the knees allows side sleeping.

Overstuffed with 800FP hydrophobic down that is 100% Responsible Down Standard (RDS) Certified ensuring humane treatment and traceability throughout the supply chain.

Redesigned draft collar and draft tubescreate a secure seal to keep cold air out.

Redesigned Toester™ waterproof/breathable footbox relies on an additional layer of synthetic insulation to reduce cold spots.

Offset zipper creates a thermally efficient seal.

Updated profile secures warmth closer to the body.

Protected by the NEMO Lifetime Warranty.



Compression stuff sack


Mesh storage bag

Short  Regular Long
Minimum Weight 1.29kg / 2.88lb 1.36kg / 3.0lbs 1.41kg / 3.13lbs
Packed Size 38 x 20 cm / 15.0x8.0" 39 x 20cm / 15.5x8.0" 41 x 22cm / 16.0x8.5"
Temp Rating 0F / -18C 0F / -18C 0F / -18C
Fill Type 800FP Down 800FP Down 800FP Down
Fill Weight 700g / 1.54lbs 720g / 1.56lbs 760g / 1.68lbs
Fits Up To 168cm / 5'6" 183 cm/ 6' 198cm / 6'6"
Shoulder Girth 47cm / 58" 155cm / 61" 175cm / 69"
Hip Girth 56 in / 142 cm 58 in / 147 cm 63 in / 160 cm
Knee Girth 52 in / 132 cm 53 in / 135 cm 56 in / 142 cm
Compressed Volume 7.19 7.7 8.03

Shell Fabric         20D Nylon Ripstop w/ DWR

Footbox Fabric   40D Nylon Ripstop OSMO™ w/ DWR

Lining Fabric       30D Nylon Taffeta w/ DWR

Color     Granite / Sunburst Yellow

Zipper Location Left

Stuff Sack            Compression stuff sack, Mesh storage bag

Insulation            800 FP Down


NEMO | Sonic Down Sleeping Bag

Thermo™ Gills allow you to regulate this zero degree bag on milder nights by as much as 20°F/11°C without letting cold drafts inside. • Stretch construction at the knees offers extra volume for side sleeping but keeps the bag close to your body for thermal efficiency. • Premium fabrics and 850 fill power down manage moisture and provide maximum warmth and compressibility. • Available in 0 and 15 degree temperature ratings.

Part Numbers

Option UPC MPN Store SKU
Regular 811666030283 nemosonicmnsreg SLE383171191

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