Sonic is built to be the only bag you need from -20°F to 40°F. The Backpacker Editors’ Choice award-winning big-mountain bag offers exceptional warmth and tuneability with a reduced environmental impact. This bag features our next-generation Thermo Gill™ vents, with a new multistage zipper system that dramatically increases the usable temperature range of the bag and allows fine-tuning of comfort from within. Sonic’s chevron baffle construction better compartmentalizes down, eliminating migration and keeping the down evenly lofted. (Not to mention, it looks awesome.)

The shell and liner fabrics are 100% recycled fabrics and bluesign® approved, and the premium 800 FP hydrophobic down is 100% Responsible Down Standard (RDS) certified. Years of history in the field yielded detailed upgrades on this bag, including a perfected profile, redesigned draft collar, and bolstered 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.

-Award-winning design updated for even greater warmth retention and adjustability across temperatures.
-Constructed with 100% recycled, bluesign® approved shell and liner fabrics.
-Second-generation Thermo Gill™ vents 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.
-Chevron baffle construction better compartmentalizes down for more uniform loft and down migration prevention.
-Stretch construction at the knees for comfortable side sleeping.
-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.

Regular
Minimum Weight 3 lb , 14 oz / 1.76 kg
Packed Weight 4 lb , 1 oz / 1.85 kg
Packed Size 14.5 x 10.5 in dia / 37 x 27 cm dia
ISO Comfort F / C
ISO Limit F / C
Fill Type 800 FP 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 L
Shell Fabric 20D 100% Recycled Nylon, Bluesign Certified Ripstop w/ DWR
Footbox Fabric 100% Recycled Nylon, Bluesign Certified
Lining Fabric 20D 100% Recycled Polyester, Bluesign Approved Taffeta w/ DWR
Color Goodnight Gray / Torch
Zipper Location Left
Insulation Down

Long
Minimum Weight 4 lb , 3 oz / 1.9 kg
Packed Weight 4 lb , 6 oz / 1.99 kg
Packed Size 15.5 x 10.5 in dia / 39 x 27 cm dia
ISO Comfort F / C
ISO Limit F / C
Fill Type 800 FP Down
Fill Weight 2 lb , 8 oz / 1.12 kg
Fits Up To 6'6" / 198 cm
Shoulder Girth 65 in / 165 cm
Hip Girth 60 in / 153 cm
Knee Girth 55 in / 140 cm
Compressed Volume 13.4 L
Shell Fabric 20D 100% Recycled Nylon, Bluesign Certified Ripstop w/ DWR
Footbox Fabric 100% Recycled Nylon, Bluesign Certified
Lining Fabric 20D 100% Recycled Polyester, Bluesign Approved Taffeta w/ DWR
Color Goodnight Gray / Torch
Zipper Location Left
Insulation Down

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