Head-to-head · Best 0 Degree Sleeping Bags

Feathered Friends Ibis ES 0 vs Mountain Hardwear Phantom 0F/-18C

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

The short answer

Feathered Friends Ibis ES 0 comes out ahead by a clear margin (4.6 vs 4.2). The gap is mostly about Winter campers in cold, wet, or condensation-prone conditions who want a conservatively rated bag and will pay top dollar for a waterproof shell. — read the strengths below before deciding.

Higher ratedRanked #2 in Best 0 Degree Sleeping Bags

Feathered Friends Ibis ES 0

4.6

$859as of Jun 8

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
— Conservative 0°F rating means real-world comfort at the stated temperature

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
— Waterproof shell adds weight and slightly less breathability than open nylon

$859 · Buy at featheredfriends.com Full review →

Ranked #5 in Best 0 Degree Sleeping Bags

Mountain Hardwear Phantom 0F/-18C

4.2

$700as of Jun 7

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
— Massive draft tubes and effective hood cinches to seal in heat

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
— Narrow cut feels restrictive for stomach and starfish sleepers

$700 · Buy at mountainhardwear.com Full review →

How they stack up

Feathered Friends Ibis ES 0

The highest-loft and most weather-resistant bag here thanks to 900+ fill and a Pertex Shield EX shell, rivaling the Western Mountaineering Kodiak MF for warmth but heavier than it, the Mountain Hardwear Phantom 0, the Therm-a-Rest Parsec 0F and the Sea to Summit Spark 0F.

Mountain Hardwear Phantom 0F/-18C

The most divisive bag here, lighter than the Western Mountaineering Kodiak MF and Feathered Friends Ibis ES 0 but with sharply split warmth verdicts, and less of a sure thing than the Therm-a-Rest Parsec 0F or the ultralight Sea to Summit Spark 0F.

Specs side-by-side

Spec	Feathered Friends Ibis ES 0	Mountain Hardwear Phantom 0F/-18C
Temperature Rating	0°F (-17.7°C) comfort	0°F limit / 13°F comfort
Fill Power	900+ goose down	800-850 goose down
Fill Weight	1 lb 15.2 oz (884 g)	2.04 lb
Total Weight	3 lb 2.4 oz (1429 g)	2 lb 11 oz - 3 lb (long)
Shell	Pertex Shield EX waterproof-breathable	20D nylon taffeta
Shoulder Girth	59 in	—
Packed Size	17 L	—
Origin	Made in Seattle, USA	—
Cut	—	Narrow mummy
Features	—	Draft tubes, hood cinches
Warranty	—	Limited lifetime

← See the full ranking of best 0 degree sleeping bags