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The Best 5Aggregated review·12 sources·updated May 24, 2026·checked July 30, 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. No publisher printed a score for the top pick — its rating is derived from what reviewers wrote. 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

Feathered Friends Ibis ES 0 is our top pick for 0 degree sleeping bags — an averaged 4.6/5 across 2 published reviews at about $859. Runner-up: Sea to Summit Spark 0F (~$679).

Read the Feathered Friends Ibis ES 0 review →$859 · Buy at featheredfriends.com
At a glance5 products ▾
1Feathered Friends Ibis ES 0Top Score
2 sourcesall 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
2Sea to Summit Spark 0F
3 sourcesall derived
$679Best for: Gram-counting ultralight backpackers who want the smallest, lightest true 0°F down bag and camp in dry cold.
$679 · Check Price on Amazon
3Western Mountaineering Kodiak MF
2 sources1 derived
$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
4Therm-a-Rest Parsec 0F/-18C
3 sourcesall derived
$480Best for: Weight- and budget-conscious winter backpackers who want a genuinely light 0°F down bag and sleep on the warmer side.
$480 · Buy at spokex.com
5Mountain Hardwear Phantom 0F/-18C
2 sources1 derived
$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

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 →
Feathered Friends Ibis ES 0
#1 · Top Score
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
2 sourcesall derived$859as of Aug 1
▾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
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. Sea to Summit Spark 0F →
Sea to Summit Spark 0F
#2
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
3 sourcesall derived$679as of Aug 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. 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
$679 · Check Price on AmazonFull review →vs. Feathered Friends Ibis ES 0 →
Western Mountaineering Kodiak MF
#3
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
2 sources1 derived$795as of Aug 1
▾Why it's ranked here

The Kodiak MF is the warmest 0°F bag most reviewers have ever tested, beating 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 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. Feathered Friends Ibis ES 0 →
Therm-a-Rest Parsec 0F/-18C
#4
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
3 sourcesall derived$480as of Aug 1
▾Why it's ranked here

The Parsec 0F is the warmth-to-weight standout of this group: at 2 lb 6 oz it is one of the lightest true 0°F down bags you can buy. Advnture and The Trek both rate it 4.5/5, praising the loft and the value, 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
  • — Still expensive at $490-$570 in absolute terms
  • — One real-world cold test recommended a 5°F practical floor, not 0°F
$480 · Buy at spokex.comFull review →vs. Feathered Friends Ibis ES 0 →
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 sources1 derived$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. Feathered Friends Ibis ES 0 →
Reviews aggregated from
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Spec comparison

5 products
vs
SpecFeathered Friends Ibis ES 0Sea to Summit Spark 0F
Temperature Rating0°F (-17.7°C) comfort0°F limit / 14°F comfort
Fill Power900+ goose down850+ Ultra-Dry goose down
Fill Weight1 lb 15.2 oz (884 g)29.6 oz (840 g)
Total Weight3 lb 2.4 oz (1429 g)2 lb 7 oz (1113 g)
ShellPertex Shield EX waterproof-breathableUltralight nylon
Packed Size17 L9.9 L
Zipper—Full-length YKK with draft tube
Cut—Snug ultralight mummy
Material—Nylon
Warranty——

Frequently asked questions

Which 0 degree sleeping bag should I buy?
Feathered Friends Ibis ES 0 holds the top score for 0 degree sleeping bags — 4.6/5 averaged from 2 published reviews. 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.
How current is this ranking?
This guide was last re-checked in May 2026. Prices, links, and source ratings are re-verified on a rolling basis, and the ranking updates when the underlying scores change.

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