The Thermodown 0 is a four-season down sleeping bag rated to 0F (-17C), built with 28.6 oz of RDS-certified 800 fill-power duck down in a 20D ripstop nylon shell with a PFC-free DWR finish. It weighs 2 lb 9 oz and packs to 10 x 7 inches, which is light and compact for a bag this warm. The split baffle pattern keeps down from shifting into cold spots, and a two-way YKK zipper, wide zipper guard, draft collar and pad straps round out the feature set. It suits cold-weather backpackers and campers who want a light, packable winter bag; against rival 0F down bags it competes on weight and fill quality rather than on extra features.
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Lowest price we've seen: $229.99 on Nov 12 at Paria Outdoor Products. Tracked across 1 store since Nov 12.
Owners rate the Thermodown 0 highly, with 4.7 out of 5 across 104 ratings. They praise its warmth for the weight and how small it packs, and most find the zipper and draft collar work well in cold conditions.
The Thermodown 0 is a four-season down sleeping bag rated to 0°F (-17°C). It is insulated with 28.6 ounces of 800-fill-power RDS-certified duck down. The 2026 redesign makes it 15 percent lighter and more packable than the previous version.
The shell and lining are 20D ripstop nylon with a PFC-free DWR treatment. A split baffle pattern keeps cold spots from migrating down the bag. A phone pocket keeps your electronics within reach, and sleeping pad straps help keep you on your pad.
A large two-way YKK zipper opens from the top and bottom to release heat, and a wide zipper guard helps prevent snags. A draft collar wraps around your neck on its own, with no drawstrings or Velcro. The fully insulated, contoured hood cinches down completely. The trapezoidal foot box has extra insulation.
