Shelter · Gear Review
Sleeping bags. Buy for your coldest night, not the number on the label.
For a household that wants one bag for a cold house, a winter car, and the odd camping trip, the Teton Celsius XXL is our top pick: roomy, warm well below freezing in testing, and inexpensive. The Coleman Brazos 20 covers mild nights for less. The North Face Wawona Bed 20 zips to a second bag for a couple or a parent and child. For camping you carry, the Kelty Cosmic Down 20 is the one bag here with a lab-tested rating.
Top pick
Teton Celsius XXL 0°F
Insulation
Synthetic
Size
90 x 39 inches
At a glance: Teton Celsius XXL 0°F
Strengths
- CleverHiker's testers found it comfortable from about 10°F to 45°F, a wide margin for a cold house or a winter car.
- At 90 by 39 inches, it gives broad and tall sleepers room to roll over.
- The full-length zipper opens it flat into a blanket for a couch or a shared bed.
- It costs less than most bags this warm, about $85 to $100 when we checked.
Limitations
- Like the other roomy bags we compared, it has no lab-tested comfort rating, only the maker's own numbers.
- At about 7 pounds with a bulky stuff sack, it is a car and closet bag, not one to carry.
- Teton says to wash it by hand and warns that machine washing can void the warranty.
- The zipper snags for some owners and testers.
By Dan Whelan, founder of New World Survival
Researched from CDC, CPSC, U.S. Fire Administration, and NIH guidance, maker documentation, independent testing, and owner reports. See our sources
The one thing to know
A "20" bag is a name. It is not a promise of 20°F.
Three of the four bags on this page carry a single temperature in their names and no lab test behind it. When independent testers slept in popular 20-degree rectangular bags, they often found them comfortable only well above that: Switchback Travel suggests 40 to 45°F for cold sleepers in The North Face Wawona Bed 20, (Switchback Travel) and CleverHiker puts its practical range at 40 to 70°F. (CleverHiker) The one lab-rated bag here, the Kelty, performed close to its tested comfort figure, which Treeline Review confirmed over about 50 nights. (Treeline Review) That is why our sleeping bag handbook tells you to read the comfort rating when a bag has one, and to leave a wide margin when it does not.
The margin matters because the cold does not need to be extreme to be dangerous. The CDC says hypothermia is most likely at very cold temperatures but can happen even above 40°F if a person becomes chilled from rain, sweat, or cold water, and it lists babies sleeping in cold bedrooms and older adults without enough heat among those most at risk. (CDC) So buy a bag rated well below your coldest night, keep it dry, and put a pad under it. A bag on a bare floor sleeps far colder than its label, and our sleeping pad comparison covers the other half of a warm night.
And keep the heat from becoming the danger. The CPSC says never to use fuel-burning portable heaters or lanterns while sleeping in enclosed areas such as tents, campers, and vehicles. (CPSC) The U.S. Fire Administration says to keep bedding at least 3 feet from any heater and to turn heaters off when you go to bed. (U.S. Fire Administration) An adult or camping sleeping bag is not for a baby: the NIH Safe to Sleep campaign advises keeping blankets and comforters out of a baby's sleep area and dressing the baby in a wearable blanket instead. (NIH Safe to Sleep)
The field
Four bags, matched to where they sleep.
These are the bags we could buy new on November 9, 2026, chosen for the three jobs a household bag usually has: a cold house when the heat goes out, a winter car, and camping. Sizes, weights, and ratings come from the makers and REI; price ranges from listings the same day. We did not bench-test them. Where independent testers slept in them, we say what they found.
Teton Celsius XXL 0°F
- Best for: a cold house, a winter car
- Fill and shape: synthetic, oversized rectangle with hood
- Rating: 0°F maker rating, no lab test
- Size: 90 x 39 inches, about 7 pounds
- Opens flat: yes
- Typical price: about $85 to $100
Coleman Brazos 20
- Best for: mild nights, a tight budget
- Fill and shape: synthetic rectangle, no hood
- Rating: 20°F maker rating, no lab test
- Size: 75 x 33 inches, fits to 5 ft 11 in
- Opens flat: yes, and zips to a second bag
- Typical price: about $55 to $70
The North Face Wawona Bed 20
- Best for: couples, a parent and child
- Fill and shape: synthetic rectangle, no hood
- Rating: 20°F maker rating, no lab test
- Size: Regular or Long, about 5 pounds
- Opens flat: yes, and pairs into a double
- Typical price: about $130 to $160
Kelty Cosmic Down 20
- Best for: camping you carry
- Fill and shape: 550-fill down, mummy
- Rating: ISO comfort 31 to 32°F, lower limit 21°F
- Size: Short, Regular, Long, about 2.5 pounds
- Opens flat: no
- Typical price: about $180 to $210
Sources: Teton size, weight, and rating from Teton; Brazos size, fit, and zipper from Switchback Travel; Wawona sizes, weights, and zippers from Switchback Travel and REI; Kelty ISO 23537 figures from REI (31°F) and older Kelty and retailer listings (32°F). Prices from Amazon, makers, and retailers, read November 9, 2026. Prices move often.
Our picks
A warm, roomy bag for home and car, and a light one for the trail.
We weighted real warmth most, because the bag that matters in an outage is the one that keeps you warm at the coldest hour, and a misleading label is the most common way a household ends up cold. Room came next, since a bag used on a couch or a bedroom floor should feel like a bed. Price and how easy the bag is to keep came after that.
Top pick
Teton Celsius XXL 0°F
An oversized synthetic bag, 90 by 39 inches with a mummy-style hood, that Teton rates to 0°F and describes as comfortable from 25 to 30°F. (Teton) CleverHiker, which named it its budget cold-weather pick, found it at its best from about 10°F to 45°F, noted cold spots in the rectangular corners below about 10°F, and called it an inexpensive way to make a warm, roomy bed for cold nights. (CleverHiker) That range is why it wins for a household: a house without heat, or a car on most winter nights, falls within it, though in deep cold you will still want a pad, a hat, and extra layers. The full-length zipper opens it into a blanket, but it is no summer bag: CleverHiker's tester was uncomfortably hot on a 60°F night even with it open. It is heavy, about 7 pounds, and it has no lab rating; no roomy synthetic bag we found in stock did. On November 9, 2026, it was shipped and sold by Amazon.
Check price on AmazonBudget, mild nights
Coleman Brazos 20
A simple rectangle, 75 by 33 inches, with a soft lining, a two-way zipper that opens it flat, and the ability to zip to a second Brazos. Testers disagree about its warmth: Switchback Travel found its 20°F rating seemed accurate, (Switchback Travel) while CleverHiker would not use the 30°F version below 40°F, (CleverHiker) and OutdoorGearLab found the 30°F version warmer than its rating but narrow and short, a better fit for young campers and smaller adults. (OutdoorGearLab) We read that as a good bag for a heated cabin, a summer campground, or a layer under blankets at home, and not one to trust alone near freezing. It fits sleepers to about 5 feet 11 inches, so taller sleepers should look elsewhere.
Check price on AmazonTwo people, or a parent and child
The North Face Wawona Bed 20
A soft, roomy rectangle with a wraparound zipper that lets it lie flat as a blanket and pair with a second Wawona into a double. A Switchback Travel tester shared the open top with a 7-year-old, (Switchback Travel) and CleverHiker found the synthetic fill stayed warm after heavy dew and dried in about two hours. (CleverHiker) Its weak point is warmth: the same testers put it at 40 to 45°F for cold sleepers, and GearJunkie called it more of a 30°F bag. (GearJunkie) It has no hood. Choose it for shared beds and family camping in mild weather, not for the winter car.
Check price on AmazonLighter, lab-rated, for camping you carry
Kelty Cosmic Down 20
About 2.5 pounds of 550-fill down in a mummy cut, and the only bag here with ISO 23537 lab figures: comfort 31°F and lower limit 21°F on REI's listing. (REI) Treeline Review, over about 50 nights across several versions, found it comfortable to its comfort rating and usable near 20°F only with layers, a good pad, and a tent, and called it the best value in camping bags. (Treeline Review) CleverHiker found it reliably comfortable around 30°F and called the narrow cut its main drawback. (CleverHiker) Down packs small and lasts, but it loses warmth when wet, so this is the camping bag, not the one for a damp car.
Check price on AmazonHow we link here
The buy links go to Amazon, and New World Survival earns a small commission if you buy through them, at no cost to you. Commission never decides a recommendation. The experts' favorite camping bag, REI's Siesta Hooded 20, is sold only by REI and was on pre-order when we checked; it is covered below.
What owners actually say
Room and warmth win people over. Zippers and bulk are the complaints.
These patterns come from the Teton's Amazon reviews (nearly 8,000 ratings, about four in five of them five stars), REI and Backcountry reviews of the Wawona, REI and Trailspace owner reviews of the Kelty, and owner summaries from Reddit and review aggregators, read November 9, 2026. We found no owner reports covering more than a year for the synthetic bags.
The room
The most common praise for the Teton is space: room to roll over, to sleep on a side, and to feel more like a bed than a sleeping bag. Owners also call it warm on cold nights and good value. Wawona owners say much the same about softness and room, and several use it on mild-weather car camping trips.
The trouble spots
Zippers draw the most complaints across every bag here: snagging on the fabric, sticking, or not opening as fully as an owner hoped. Experts split on the same point, with some testers finding a model smooth and owners of that model reporting snags. Next comes bulk. The Brazos is hard to roll back into its sack, and owners call the Teton heavy and bulky.
The surprises
Owners of the Wawona and the lab-rated Kelty say the number in the name is optimistic and that they were chilly near freezing. Brazos owners are more forgiving of its warmth, though they note it needs a good pad under it on the ground. And a few reviewers of the warmer bags found them too hot in a heated room, a reminder that a bag rated for a cold house is meant to be unzipped when the furnace comes back.
Kelty owners on Trailspace and REI most often praise its warmth for the weight and its small packed size. A smaller number report down shifting between baffles or escaping through a seam, and a stuff sack that wore out. Trailspace owners who used theirs for a year or more report the fabric, zipper, and seams holding up well.
How they fail, and what they cost over time
Most bags wear out slowly. Storage decides how slowly.
Crushed loft
A bag left squeezed in its stuff sack for months loses loft, and loft is the warmth. REI advises storing a bag loosely in a large cotton or mesh sack instead. (REI) The North Face gives the same advice and adds that the bag should be fully dry first. (The North Face) For a bag that waits in a closet for an outage, this is the whole maintenance plan.
Zippers and seams
Zippers are where owners report trouble most, so ease them around corners and keep fabric clear of the teeth. Down bags can leak a feather or two through a seam; a small tear patches with repair tape. A zipper or seam that fails early is a warranty question, not wear.
Washing it wrong
Coleman and Kelty both warn against a top-loading washer with a center agitator. Coleman and The North Face call for a large front-loading washer and Kelty for a full-size machine without an agitator, all three dry on low heat, and Coleman and Kelty suggest tennis or dryer balls. (Coleman, Kelty, The North Face) Teton is the exception: it says to hand wash in a tub and air dry, and that machine washing can void the warranty. (Teton)
The warranty
Kelty covers sleeping bags against manufacturing defects for their reasonable lifetime, (Kelty) and The North Face offers a limited lifetime warranty for the original owner, excluding normal wear. (The North Face) Teton's product page promises a limited lifetime guarantee. We could not load Coleman's warranty page, so check the box. Keep the receipt either way.
The running costs
Close to none. A bag needs no fuel, no batteries, and nothing that wears out on a schedule. Over the years you may buy a large storage sack if the bag did not come with one, a bottle of down or synthetic wash every few washes, and a roll of repair tape. A liner is the one optional upgrade that pays back: it keeps a lent-around household bag clean, which means fewer washes, and adds a little warmth. The real cost of owning a bag is the pad that goes under it, which our sleeping pad comparison covers.
What we didn't pick, and who should skip
Good bags we could not buy, and households that need none yet.
REI Co-op Siesta Hooded 20
The camping bag most experts name first: Switchback Travel, CleverHiker, and GearJunkie each call it their best overall. It is roomy, hooded, opens flat, and costs about $150. Testers found it comfortable to about 35 to 40°F and needed layers below that. (Switchback Travel, CleverHiker) On November 9, 2026, REI, its only seller, listed every size as sold out with pre-orders shipping within 30 days. (REI) If you camp in mild weather and can wait, it is a fine choice. We will revisit when it is back in stock.
NEMO Forte 20
A synthetic bag with ISO comfort 29°F and lower limit 18°F, a roomy spoon shape, vents, and a zipper that pairs with a second bag. It is the lab-rated synthetic we would choose if you camp in the cold and want a tested number. It costs roughly twice as much as our top pick, it is not a true rectangle, and REI showed it on pre-order when we checked. (REI)
REI Co-op Trailmade 25
An inexpensive lab-rated synthetic, ISO comfort 31°F, in six sizes. (REI) CleverHiker found its comfort figure matched the field. (CleverHiker) It is a mummy bag, which is efficient on a trail but cramped on a couch or a bedroom floor, so it fits backpackers better than households.
ALPS OutdoorZ Redwood
OutdoorGearLab's top camping bag, and very warm in its testing. (OutdoorGearLab) It is also very large and heavy. We have not checked its stock, and for most homes the Teton gives similar room and warmth for less.
Skip a bag if your bedding is enough
For a night or two at home, the comforters and blankets you own, layered over a foam pad, go a long way. The pad is the first purchase. Our handbook's cold-house section shows how, and the sleeping pad comparison picks the pad. For a short emergency on the road, an emergency bivvy is lighter and cheaper than a bag.
Skip these for children and babies
The ISO rating standard covers adult bags only, and a child in a long adult bag has a lot of empty space to heat, so look for a bag sized for children. A baby should not sleep in any adult or camping sleeping bag; a wearable blanket is the safe way to keep a baby warm.
Where it fits in your readiness
Warmth with no fuel, so no one needs a heater at night.
A sleeping bag belongs to the Sustain tier: the gear that keeps a household living normally through a disruption that lasts more than a night. It earns its place in a winter storm or an ice storm that takes down the lines, and in any long power outage in cold weather, when the safest heat is the heat your own body makes. Our checklists include blankets, sleeping bags, and warm layers for everyone.
Power outage checklist
What to have ready before the lights go out, and what to do after.
Winter storm checklist
Blankets, sleeping bags, and layers for everyone before the storm.
Ice storm checklist
When the lines come down and the repairs take days.
Heating during outages
Safe ways to warm one room, and what never comes inside.
Questions people ask
About sleeping bags.
Is a 20 degree sleeping bag warm enough?
Often not at 20 degrees F. The number in a bag's name is not a comfort promise. Testers found the Wawona on this page comfortable closer to 40 to 45 degrees F for cold sleepers, though they split on the Coleman Brazos. If a bag has a lab rating, read its comfort figure if you sleep cold. If it has only one number, buy well below your coldest night and put a good pad underneath.
Can I use a camping sleeping bag at home when the power goes out in winter?
Yes, and it is one of the best uses for one. Sleep in one smaller room together, put a foam pad or cushions under each person, and layer blankets on top. The CDC says never to use generators, grills, or other gasoline-, propane-, or charcoal-burning devices inside your home. An adult sleeping bag is not for a baby; the NIH Safe to Sleep campaign advises a wearable blanket instead.
Do I need a sleeping pad if I have a warm sleeping bag?
Yes. Your weight crushes the insulation under you, so the floor or ground pulls heat out of your back no matter how warm the bag is. A closed-cell foam pad is the inexpensive fix, and our sleeping pad comparison covers the rest.
Can you wash a sleeping bag?
Most, yes, but check the maker. Coleman and The North Face describe a large front-loading washer, Kelty a full-size machine without an agitator, and all three dry on low heat. Coleman and Kelty warn against a top-loader with a center agitator. Teton says to hand wash its bags and warns that machine washing can void the warranty.
What sleeping bag should I keep in my car for winter?
A warm synthetic bag, because synthetic insulation keeps more of its warmth than down when it gets damp. Store it loose in a large sack rather than crushed in its stuff sack, and pair it with a foam pad. Never run a fuel-burning heater in a closed car while anyone sleeps.