Verdict
All guidesResearchOpen dataMethodologyAboutContact
The Best 5Aggregated review·12 sources·updated October 7, 2026·checked September 11, 2026

Best 0 Degree Sleeping Bags

Top 5 zero-degree winter sleeping bags ranked by aggregate score from 12 published reviews.

This guide aggregates 12 published reviews across 5 products; the thinnest-sourced pick rests on 2. How we rank.

Verdict is reader-supported. As an Amazon Associate we earn from qualifying purchases. Some links on this page are affiliate links — if you click through and buy, we may earn a small commission at no extra cost to you. Our ratings are sourced from independent publications, not sponsors.
Quick answer

Therm-a-Rest Parsec 0F/-18C is our top pick for 0 degree sleeping bags — an averaged 4.5/5 across 1 published review at about $600. Runner-up: Feathered Friends Ibis ES 0 (~$859).

Read the Therm-a-Rest Parsec 0F/-18C review →$600 · Buy at spokex.com
At a glance5 products ▾
1Therm-a-Rest Parsec 0F/-18CTop Pick
1 source
$600Best for: Weight- and budget-conscious winter backpackers who want a genuinely light 0°F down bag and sleep on the warmer side.
$600 · Buy at spokex.com
2Feathered Friends Ibis ES 0
1 sourceall derived
$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
3Sea to Summit Spark 0F
2 sourcesall derived
$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
4Western Mountaineering Kodiak MF
1 source
$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
5Mountain Hardwear Phantom 0F/-18C
2 sources
$770Best for: Experienced winter backpackers who sleep warm, want a light efficient mummy, and pair it with a high-R-value pad.
$770 · Buy at mountainhardwear.com

Derived means the reviewer published no score, so one was inferred from their written verdict. Everything else is a number the publisher printed. How we rank.

The full ranking

How we rank →
Therm-a-Rest Parsec 0F/-18C
#1 · Top Pick
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
1 source$600as of Sep 25
▾Why it's ranked here

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
Watch-outs
  • — One real-world cold test recommended a 5°F practical floor, not 0°F
$600 · Buy at spokex.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
1 sourceall derivedOne review so far, so ranked one place lower$859as of Oct 10
▾Why it's ranked here

The Ibis ES 0 pairs 900+ fill power goose down with a waterproof-breathable Pertex Shield EX shell, which makes it the bag to beat for cold, damp winter conditions. Feathered Friends rates conservatively, so its 0°F sits closer to a true comfort rating than a survival limit. It is the widest of the brand's zero-degree bags, and 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, per Backwoods Pursuit
Watch-outs
  • — Heavy for a 0°F down bag at 3 lb 2.4 oz for the regular
$859 · Buy at featheredfriends.comFull review →vs. Therm-a-Rest Parsec 0F/-18C →
Sea to Summit Spark 0F
#3
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
2 sourcesall derived$999as of Oct 11
▾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. Against that: a snug, less-forgiving cut, a thin shell offering little wet-weather protection, and 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. Therm-a-Rest Parsec 0F/-18C →
Western Mountaineering Kodiak MF
#4
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
1 sourceOne review so far, so ranked one place lower$795as of Oct 10
▾Why it's ranked here

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
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. Therm-a-Rest Parsec 0F/-18C →
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
2 sources$770as of Sep 11
▾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
  • — Thin shell fabric can let feathers shift and create cold spots
  • — Narrow cut feels restrictive for stomach and starfish sleepers
$770 · Buy at mountainhardwear.comFull review →vs. Therm-a-Rest Parsec 0F/-18C →
Reviews aggregated from
BackwoodspursuitOutdoorgearlabAdvntureThetrekCaptainberzPackwizardBikehikesafariOutsidebozeman

Spec comparison

5 products
vs
SpecTherm-a-Rest Parsec 0F/-18CFeathered Friends Ibis ES 0
Temperature Rating0°F limit / 14°F comfort (ISO)0°F (-17.7°C) comfort
Fill Power800 Nikwax Hydrophobic goose down900+ goose down
Total Weight2 lb 6 oz (1.09 kg)3 lb 2.4 oz (1429 g)
ZipperTwo-way YKK side zip—
WarrantyLimited lifetime—
MaterialNylon—
Fill Weight—1 lb 15.2 oz (884 g)
Shell—Pertex Shield EX waterproof-breathable
Packed Size—17 L
Cut——

Frequently asked questions

Which 0 degree sleeping bag should I buy?
Therm-a-Rest Parsec 0F/-18C is the top pick for 0 degree sleeping bags — 4.5/5 averaged from 1 published reviews. 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.
How current is this ranking?
This guide was last re-checked in October 2026. Prices, links, and source ratings are re-verified on a rolling basis, and the ranking updates when the underlying scores change.

Related guides

Browse all →