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The Best 5Reviewed by Mike Hunter·July 7, 2026·checked June 30, 2026

Best 0 Degree Sleeping Bags

Top 5 zero-degree winter sleeping bags reviewed and ranked.

At a glance5 products ▾
1Western Mountaineering Kodiak MFTop Score
(3 sources)
$795Best for: Cold-weather campers and side sleepers who want the most reliable 0°F warmth and room to move, and don't mind paying a premium.
$795 · Buy at shop.gohunt.com
2Feathered Friends Ibis ES 0
(3 sources)
$859Best for: Winter campers in cold, wet, or condensation-prone conditions who want a conservatively rated bag and will pay top dollar for a waterproof shell.
$859 · Buy at featheredfriends.com
3Therm-a-Rest Parsec 0F/-18C
(3 sources)
Best for: Weight- and budget-conscious winter backpackers who want a genuinely light 0°F down bag and sleep on the warmer side.
Check Price on Amazon
4Sea to Summit Spark 0F
(3 sources)
$999Best for: Gram-counting ultralight backpackers who want the smallest, lightest true 0°F down bag and camp in dry cold.
$999 · Check Price on Amazon
5Mountain Hardwear Phantom 0F/-18C
(3 sources)
$700Best for: Experienced winter backpackers who sleep warm, want a light efficient mummy, and pair it with a high-R-value pad.
$700 · Buy at mountainhardwear.com
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The full ranking

How we rank →
Western Mountaineering Kodiak MF
#1 · Top Score
Best for: Cold-weather campers and side sleepers who want the most reliable 0°F warmth and room to move, and don't mind paying a premium.
Western Mountaineering Kodiak MF
from 3 sources$795as of Jul 1
▾Why it's ranked here

The Kodiak MF is the warmest 0°F bag most reviewers have ever tested, exceeding its rating with a roomy, side-sleeper-friendly cut. 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 versus 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
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.comFull review →vs. Feathered Friends Ibis ES 0 →
Feathered Friends Ibis ES 0
#2
Best for: Winter campers in cold, wet, or condensation-prone conditions who want a conservatively rated bag and will pay top dollar for a waterproof shell.
Feathered Friends Ibis ES 0
from 3 sources$859as of Jul 1
▾Why it's ranked here

The Ibis ES 0 pairs 900+ fill power goose down with a waterproof-breathable Pertex Shield EX shell, making it the bag to beat for cold, damp winter conditions. Feathered Friends rates conservatively, so its 0°F is closer to a true comfort rating than a survival limit. It is the widest of the brand's zero-degree bags, but it is also among the heaviest here at 3 lb 2 oz.

Strengths
  • — 900+ fill power goose down, the highest-loft insulation in this group
  • — Waterproof-breathable Pertex Shield EX shell handles condensation and damp tents
Watch-outs
  • — Heavy for a 0°F down bag at 3 lb 2.4 oz for the regular
  • — List price of $859 puts it at the top of the category
$859 · Buy at featheredfriends.comFull review →vs. Western Mountaineering Kodiak MF →
Therm-a-Rest Parsec 0F/-18C
#3
Best for: Weight- and budget-conscious winter backpackers who want a genuinely light 0°F down bag and sleep on the warmer side.
Therm-a-Rest Parsec 0F/-18C
from 3 sources
▾Why it's ranked here

The Parsec 0F is the warmth-to-weight champion of this group, at 2 lb 6 oz one of the lightest true 0°F down bags you can buy. Reviewers across The Trek, Advnture, and SectionHiker praise its loft and value, though it uses 800-fill down and at least one cold-test reviewer found its honest comfort floor closer to 5°F than 0°F. At around $530 it badly undercuts the premium bags here.

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
Watch-outs
  • — Still expensive at $490-$570 in absolute terms
  • — One real-world cold test recommended a 5°F practical floor, not 0°F
Check Price on AmazonFull review →vs. Western Mountaineering Kodiak MF →
Sea to Summit Spark 0F
#4
Best for: Gram-counting ultralight backpackers who want the smallest, lightest true 0°F down bag and camp in dry cold.
Sea to Summit Spark 0F
from 3 sources$999as of Jul 1
▾Why it's ranked here

The Spark 0F is the ultralight of this group, packing a genuine 0°F-rated bag into about 2 lb 7 oz and a sub-10-liter stuff size. It uses 850+ fill Ultra-Dry down and reviewers find its temperature rating accurate. The trade-offs are a snug, less-forgiving cut and a thin shell that offers little wet-weather protection, plus a steep price for the warmth.

Strengths
  • — Among the lightest 0°F down bags at roughly 2 lb 7 oz
  • — Sub-10-liter packed size, the most compressible bag here
Watch-outs
  • — Snug ultralight cut is less forgiving than the Kodiak or Ibis
  • — Thin shell offers little wet-weather protection
$999 · Check Price on AmazonFull review →vs. Western Mountaineering Kodiak MF →
Mountain Hardwear Phantom 0F/-18C
#5
Best for: Experienced winter backpackers who sleep warm, want a light efficient mummy, and pair it with a high-R-value pad.
Mountain Hardwear Phantom 0F/-18C
from 3 sources$700as of Jun 7
▾Why it's ranked here

The Phantom 0 is a polarizing bag: CleverHiker calls it 'one of the warmest backpacking sleeping bags we've tested' while OutdoorGearLab found it 'freezing all night' at zero degrees. It pairs a light 800-fill build with a buttery-soft 20D shell and a narrow, weight-efficient cut. Real owners on Trailspace report comfort to 2°F, so fit and individual metabolism clearly matter with this one.

Strengths
  • — Excellent warmth-to-weight ratio in a roughly 2 lb 11 oz package
  • — Smooth, soft 20D nylon taffeta shell that's pleasant against skin
Watch-outs
  • — OutdoorGearLab tested it 'freezing all night' at 0°F and scored it 56/100
  • — Thin shell fabric can let feathers shift and create cold spots
$700 · Buy at mountainhardwear.comFull review →vs. Western Mountaineering Kodiak MF →
Reviews aggregated from
Outdoorgearlab.comBackwoodspursuit.comEvolutionbasin.comWesternmountaineering.comFeatheredfriends.comPackwizard.comAdvnture.comThetrek.co

Spec comparison

5 products
vs
SpecWestern Mountaineering Kodiak MFFeathered Friends Ibis ES 0
Temperature Rating0°F (-18°C)0°F (-17.7°C) comfort
Fill Power850+ goose down900+ goose down
Weight2 lb 12 oz3 lb 2.4 oz (1429 g)
Material20D MicroLite XP nylonPertex Shield EX waterproof-breathable
ShapeWide mummy, continuous bafflesWide mummy, continuous baffles
Packed Size—17 L

Frequently asked questions

What is the best 0 degree sleeping bag?
Western Mountaineering Kodiak MF is our top pick for 0 degree sleeping bags, with an averaged rating of 4.6/5 from 3 published reviews. The Kodiak MF is the warmest 0°F bag most reviewers have ever tested, exceeding its rating with a roomy, side-sleeper-friendly cut. 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 versus narrower mummies.
Is there a cheaper alternative worth considering?
Therm-a-Rest Parsec 0F/-18C rates 4.5/5 in our analysis. The Parsec 0F is the warmth-to-weight champion of this group, at 2 lb 6 oz one of the lightest true 0°F down bags you can buy. Reviewers across The Trek, Advnture, and SectionHiker praise its loft and value, though it uses 800-fill down and at least one cold-test reviewer found its honest comfort floor closer to 5°F than 0°F. At around $530 it badly undercuts the premium bags here.
How does Verdict rank these products?
Every rating on Verdict is the numerical average of scores published by independent review sites, YouTube reviewers, and Reddit buyer reports. No editor adjusts the order — the ranking is whatever the source data produces. See our methodology page for the full process.
When was this guide last updated?
This guide was last re-checked in July 2026. We re-run our research pipeline for each category on a rolling basis so prices and rankings reflect current market reality.

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