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Wild10

Gear

NEMO Sonic -20

Backpacking across variable winter temperatures

Expert reviewed

Topic summary

Backpacking across variable winter temperatures

Key takeaways

  • 800FP down
  • Thermo Gill vents
  • waterproof/breathable footbox
  • Strong warmth-to-weight performance and highly useful venting broaden the bag’s usable temperature range.

Verification notes

Evidence: expert reviewed. Last verified July 16, 2026.

NEMO Sonic -20
NEMO Equipment

Editorial take

NEMO Sonic -20 is a cold-weather sleeping bag with an advertised -20°F rating and 800FP down; Thermo Gill vents; waterproof/breathable footbox. It is best suited to backpacking across variable winter temperatures.

Not ideal for

  • Expensive, and cold sleepers may need more margin than the model number suggests.
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Verified specifications

Key features
  • 800FP down
  • Thermo Gill vents
  • waterproof/breathable footbox

Warranty and repair information: contact NEMO Equipment directly for the most current terms. NEMO Equipment support

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Data sources & verification