Gear Reviews

The 5 Best Winter Sleeping Bags

Ward off the cold with these superwarm products.

Lock Icon

Become a member to unlock this story and receive other great perks.

Already have an Outside Account? Sign in

Outside+ Logo

All Access
15% off New Year Sale
$7.02 / month*

  • A $500 value with everything in the Print + Digital Plan plus 25+ benefits including:
  • Member-only content from every title in the Outside network like Outside, SKI, Climbing, and more
  • Annual gear guides for backpacking, camping, skiing , climbing, and more
  • Gaia GPS Premium with hundreds of maps and global trail recommendations, a $39.99 value
  • Premium access to Outside TV and 1,000+ hours of exclusive shows
  • Exclusive discounts on gear, travel, and race-entry fees
  • Annual subscription to Outside magazine
Join Outside+

Print + Digital
50% Off New Year Sale
$2.00 / month*

  • Annual subscription to Backpacker magazine
  • Access to all member-exclusive content and gear reviews on
  • Ad-free access to
Join Backpacker

*Outside memberships are billed annually. Print subscriptions available to U.S. residents only. You may cancel your membership at anytime, but no refunds will be issued for payments already made. Upon cancellation, you will have access to your membership through the end of your paid year. More Details

Unfortunately, there’s no getting around it: I’m a cold sleeper. While during the day I might sweat and overheat like it’s my job, nights are a different story. This problem only increases in severity during the winter, but the five bags below go a long way toward making my snowbound nights manageable. All of these picks are already available from their manufacturers, proven over multiple winters, and are the best bets for keeping you comfy in the fourth season.

Eli’s pick: Big Agnes Orno UL 0°F

Big Agnes Orno

Winter bags are often behemoths, but the Orno UL provides a ton of warmth without taking up a ton of room in your pack. Thanks to 850-fill down, a relatively narrow lower half—it’s 36 inches around at the foot—a half zip instead of a full, and a snug, scuba-style hood, it packs down to the size of a large loaf of bread. But the Orno doesn’t feel like a coffin, and its 60-inch shoulder circumference is average for the category. This bag got me through a high-altitude trek in Nepal, and I never wished I had anything warmer or more packable. Bonus: Three size options means there’s an Orno for every sleeper. Buy the Big Agnes Orno UL 0°F now for $560

2 lbs. 7 oz. (regular); small, regular, long

Best value: Sierra Designs Nitro 800 0°F

Sierra Designs Nitro

If price is your main barrier to purchasing a four-season bag, look no further. The Nitro is well below the price of competitors, but still offers premium features; this is the back I’d recommend for folks who don’t do a ton of winter adventuring, but want to stay warm whtn it counts. The Nitro’s 800-fill down means it compresses small enough for multiday missions, and above-average dimensions (62 inches around at the shoulder, 56 inches around at the hip) offer room to wiggle when you’re tentbound. Plus, a 40-inch zipper curves in toward the head, making the Nitro easy to close once your inside. Buy the Sierra Designs Nitro 800 0°F now for $420

2 lbs. 8 oz. (regular); regular, long

Warmest: Therm-A-Rest Polar Ranger -20°F

Therm-A-Rest Polar Ranger

The Polar Ranger is the most livable winter bag I’ve ever slept in, due to two uncommon features. A chimney-style hood creates a warm zone over your face but offers plenty of breathing room, a much better option than the near-suffocation we all feel when cinching down normal hoods. Additionally, zippered vents at the shoulders allow you to put your arms through and use them normally without leaving the bag, rendering tasks like reading or drinking all the more doable in frigid conditions. (As someone who brings long novels on every trip I go on, this last feature is my favorite.) Buy the Therm-A-Rest Polar Ranger -20°F now for $690

3 lbs. 4 oz. (regular); regular, long

Best weather resistance: Feathered Friends Snowbunting EX 0

Feathered Friends Snowbunting

For cold, wet climates, you’ll need a bag that can hold off the elements. The Snowbunting EX has a Pertex Shield face fabric that’s extremely water-resistant, and is adept at blocking out condensation (or even 5 inches of snow, as I found out after I left a tent vent open during a storm in Banff National Park). The bag has a classic mummy fit and a large zipper draft tube, and its wide hood easily accommodates a pillow and multiple sleeping layers. Buy the Feathered Friends Snowbunting EX 0 now for $619

2 lbs. 13 oz. (regular); regular, long

Lightest: Western Mountaineering Versalite

Western Mountaineering Versalite

Not everywhere in the U.S. experiences bone-chilling cold in winter, and for (slightly) warmer temps, the 10°F-rated Versalite is an ultrapackable go-to. This bag’s 850-fill down allows it to compress to the size of a football, and its 62-inch shoulder circumference is above average, great for restless sleepers such as myself. An enormous draft collar effectively seals out cold air, and the Versalite is, well, the lightest bag here. Buy the Western Mountaineering Versalite now for $605

2 lbs. (regular); small, regular, large

Want more info? Take your equipment questions directly to Gear Editor Eli Bernstein for a quick consultation that’ll put you on the right track to you what you need. Email him at: