Head-to-head · Best 0 Degree Sleeping Bags

Therm-a-Rest Parsec 0F/-18C vs Western Mountaineering Kodiak MF

Which is the better buy? Side-by-side on rating, price, strengths, and watch-outs — with the published ratings we averaged to get there.

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The short answer

Therm-a-Rest Parsec 0F/-18C and Western Mountaineering Kodiak MF score essentially the same (4.5 vs 4.5). Pick the one whose trade-offs match your priorities — the strengths and watch-outs below are where they actually differ.

Ranked #1 in Best 0 Degree Sleeping Bags

Therm-a-Rest Parsec 0F/-18C

4.5

1 source$600as of Sep 25

Advnture rates it 4.5/5, while a cold-weather test by Captain Berz put the honest floor closer to 5°F than 0°F. It uses 800-fill down rather than the 850 to 900 fill of the premium bags here, and it costs far less than they do.

Strengths

— Outstanding warmth-to-weight ratio at just 2 lb 6 oz for a 0°F bag
— 800-fill Nikwax Hydrophobic Down resists moisture and dries faster
— Roughly $530 makes it the best value among true 0°F down bags

Watch-outs

— One real-world cold test recommended a 5°F practical floor, not 0°F

$600 · Buy at spokex.com Full review →

Ranked #4 in Best 0 Degree Sleeping Bags

Western Mountaineering Kodiak MF

4.5

1 source$795as of Oct 10

OutdoorGearLab consistently names it their top winter pick and found it performed more like a -20°F bag than a 0°F one. The trade-off is a list price near $900 and a wide cut that costs some warmth-to-weight efficiency against narrower mummies.

Strengths

— Tested warmer than its 0°F rating; held testers to roughly -10°F with light layering
— 1.88 lb of 850+ fill goose down with continuous baffles you can shift top-to-bottom
— Wide-cut mummy with generous shoulder, hip and footbox room for side sleepers

Watch-outs

— List price near $895-$950 is among the highest in the category
— Wide cut adds dead air space, so it is not the most weight-efficient 0°F option

$795 · Buy at shop.gohunt.com Full review →

How they stack up

Therm-a-Rest Parsec 0F/-18C

The lightest and best-value true 0°F bag here, beating the Western Mountaineering Kodiak MF, Feathered Friends Ibis ES 0 and Mountain Hardwear Phantom 0 on warmth-to-weight and price, though it uses lower 800-fill down than the Kodiak and Ibis and is heavier than the Sea to Summit Spark 0F.

Western Mountaineering Kodiak MF

The roomiest and warmest bag here, beating the Mountain Hardwear Phantom 0 and Therm-a-Rest Parsec 0F on real-world warmth and the Feathered Friends Ibis ES 0 on cut width, but it is heavier and pricier than the lighter Sea to Summit Spark 0F.

Specs side-by-side

Spec	Therm-a-Rest Parsec 0F/-18C	Western Mountaineering Kodiak MF
Temperature Rating	0°F limit / 14°F comfort (ISO)	0°F (-18°C)
Fill Power	800 Nikwax Hydrophobic goose down	850+ goose down
Total Weight	2 lb 6 oz (1.09 kg)	2 lb 12 oz
Baffles	Box-baffled, 60/40 body-mapped	—
Length	Regular 80 in	—
Extras	Pad straps, external quilt loops	—
Zipper	Two-way YKK side zip	—
Warranty	Limited lifetime	Lifetime craftsmanship
Material	Nylon	goose-down
Fill Weight	—	1.88 lb (30 oz)
Shell	—	20D MicroLite XP nylon
Cut	—	Wide mummy, continuous baffles

← See the full ranking of best 0 degree sleeping bags