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The Nemo Sonic Down Mummy Sleeping Bag is engineered for temperatures ranging from -20°F to 40°F, this Backpacker Editors’ Choice award-winning bag combines exceptional warmth with an eco-friendly design. Featuring next-generation Thermo Gill™ vents and a multistage zipper system, the Sonic allows you to fine-tune your comfort level with ease. Its chevron baffle construction prevents down migration, ensuring consistent loft and warmth. Made from 100% recycled, bluesign® approved fabrics and filled with 800 FP hydrophobic down certified by the Responsible Down Standard, this bag reflects years of field-tested improvements, including a redesigned draft collar and an innovative Toester™ footbox that keeps your feet warm and dry. Whether you’re in the backcountry or facing unpredictable weather, the Sonic sleeping bag is your go-to gear for extreme conditions, ensuring you stay comfortable and ready for whatever adventure lies ahead.
| Weight | Regular - 3 lbs 4 oz Long - 3 lbs 12 oz |
| Pack Size | Regular 13 "x 9.5" diameter Long 14" x 9.5" diameter |
| Temperature Rating | 0° |
| ISO Comfort Rating | 14F |
| ISO Limit Rating | 0F |
| Bag Shape | Mummy |
| Insulation Type | 800-fill power |
| Fill Weight | Regular - 1 lb 11 oz Long - 1 lb 13 oz |
| Shoulder Girth | Regular - 63" Long - 65" |
| Hip Girth | Regular - 58" Long - 60" |
| Knee Girth | Regular - 53" Long - 55" |
| Water-Resistant | No |
| Material | 20D 100% Recycled Nylon, Bluesign Certified Ripstop w/ DWR |
| Manufacturer Warranty | Lifetime warranty |
Overall rating: 5.0 / 5 from 1 reviews.
Review topics: [].
"This bag is amazing. I am 5’10” and 210lbs. I got the long version and there is plenty of room for me to roll around and side and even belly sleep. The bag warms up quickly and is really well made. The reinforced zipper is crucial in zipping this bag up from the inside. Still have not used in super cold temps but I am sure it’ll be fine. This bag is worthy every penny."
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