The best 4-season sleeping bags 2024: cozy bags for year round camping

Collage of eight of the best four-season sleeping bags on white background
(Image credit: Future)

During winter, you'd be extremely brave to camp out without one of the best 4-season sleeping bags. When the mercury drops, the quality of your outdoor gear becomes more and more important. Whether your camping, hiking, mountaineering, or running – winter is not the time for sub-standard kit.

Simply put, the best 4-season sleeping bags provide the level of insulation you need to be comfortable and safe during winter camps. Plus, as they're rated for every season, you'll get plenty of use out of your chosen bag, though we wouldn't recommend sleeping in one during a July heatwave.

Our team of expert testers have braved the elements, camping out in all kinds of conditions, to bring you this guide to some of the warmest and best sleeping bags on the market today.

We're particularly fond of the Nemo Kayu Down Mummy Sleeping Bag, which is extremely warm for its weight and comes with a lifetime warranty. The best 4-season sleeping bags tend to be very expensive. If you're in the hunt for value, Snugpak's Softie Expansion 5 is a great synthetic option, though it's heavier than most.

The quick list

This is the quick list, a snapshot of the best 4-season sleeping bags available in 2024. To delve deeper into the features and qualities of each featured bag, see our more detailed reviews further down the page in this guide.

The best 4-season sleeping bags 2024

You can trust Advnture Our expert reviewers spend days testing and comparing gear so you know how it will perform out in the real world. Find out more about how we test and compare products.

The best 4-season sleeping bag overall

Nemo Kayu Women’s Down Mummy Sleeping Bag on forest floor

A warm mummy-shaped sleeping bag (Image credit: Berne Broudy)

1. Nemo Kayu Down Mummy Sleeping Bag

The best 4-season sleeping bag overall

Specifications

Weight: 1.1kg / 2lb 8oz
Suits campers up to (height): 5ft 6in / 168 cm
Pack size: 32cm x 20cm / 12.5in x 8in
Fill: RDS 800 fill down
Comfort rating: -7.8°C / 18°F

Reasons to buy

+
Available in men’s and women’s versions
+
DWR Coating
+
Outer stow pocket
+
Articulated hood

Reasons to avoid

-
Women’s version is a bit short (women over 5ft 7in should opt for the men’s version)

Made from extremely light and compressible Responsible Down Standard-certified insulation that’s been treated to repel water, "this bag has several distinguishing features" so says our expert reviwer. 

Its sculpted mummy shape is contoured to follow the body’s curves for thermal efficiency, warmth retention and packability. Zippered gills on the front of the bag let allowed us to fine-tune the bag’s warmth without fully unzipping and exposing our body parts to the cold. The gills are sewn into the nylon ripstop shell on the front. Unzip the gills and they let heat out when we were too warm without letting cold air in. 

The bag has a three-quarter zip for ease of entry and exit. Its silky-feeling shell is enhanced with waterproof panels on the hood and foot box to keep the bag from getting wet from condensation where your head or foot might touch a tent wall. The insulation – which is blown into vertical baffles – is extremely warm for the weight. And, best of all, the Kayu comes with a lifetime warranty. 

The best 4-season sleeping bag for warmth

Rab Andes 800 Down Sleeping Bag in tent

A seriously warm bag for seriously cold conditions, the Andes 800 is a 4-season warrior that is even at home at high altitudes in the world’s great ranges (Image credit: Matthew Jones)
The best 4-season sleeping bag for warmth

Specifications

Weight: 1,360g / 48oz
Pack size: 45cm x 28cm / 17.7in x 1in
Shell: 13D Gore-Tex Infinium fabric (45gsm) with DWR
Lining: 20D nylon ripstop with TILT reflective technology (35gsm)
Fill: 800FP European goose down with Nikwax PFC-free hydrophobic finish (800g / 28.2oz)
Comfort rating: -23°C / -10°F

Reasons to buy

+
Extremely warm
+
Moisture-resistant down and fabrics
+
Great hood

Reasons to avoid

-
Expensive
-
Tapered cut isn’t the roomiest
-
No compression stuff sack

A "top-quality 4-season sleeping bag" according to our expert tester, the Andes Infinium 800 is well equipped to deal with temperatures that drop way below freezing. But thanks to premium 800FP down insulation, it’s also competitive in terms of both weight and packability for a bag of this class. 

There’s more, though. Unlike most down rivals, the Andes Infinium 800 is a far more practical choice for use in damp conditions, which is exactly what we found on test. The fill is treated with a hydrophobic finish, while the shell fabric is made from Gore-Tex Infinium. As such, it’s highly moisture resistant, making it a viable prospect even for cold weather use in predominantly wet climates.

Rab have also added a shiny TILT lining to the interior of the bag, which adds next to no weight but is designed to reflect radiated heat back to the body, further boosting its overall warmth. So too do other design features like the carefully considered baffle arrangement, tapered mummy cut, snug hood and contoured foot box.

Read our full Rab Andes Infinium 800 sleeping bag review

The best lightweight 4-season sleeping bag

Mountain Hardwear Bishop Pass 15F/-9C

Excellently priced, very warm bag (Image credit: Berne Broudy)

3. Mountain Hardwear Bishop Pass 15F/-9C

The best lightweight 4-season sleeping bag

Specifications

Weight: Reg: 1 kg / 2lb 5.4oz; Long: 1.1kg / 2lb 7.9oz
Length: Reg: 218cm / 86in; Long: 234cm / 92in
Pack size: 20cm x 39.5cm / 8in x 15.5in
Body fabric: 20D Ripstop Nylon 39g/m²
Fill: 650 fill down RDS cert / fluorine free
Comfort rating: -9°C / 15°F

Reasons to buy

+
Available in women’s and men’s
+
RDS down
+
Available in left and right zips

Reasons to avoid

-
Too snug for some sleepers
-
No compression stuff sack

With all the bells and whistles of much more expensive bags, Mountain Hardwear’s Bishop Pass Sleeping Bag uses high-quality, ethically-sourced, 650 fill power down certified to the Responsible Down Standard (RDS). The down is blown inside a wear- and tear-resistant 100% nylon shell for a sleeping bag that we found was light and compressible, as well as being easy to pack and carry. That makes it "an ideal sleeping bag for backpacking" according to our expert tester. One of the other features we love about the Bishop Pass is that it’s treated with a water-repelling finish that prevents it from getting wet from condensation inside the tent. 

The Bishop Pass has many of the features of the most technical winter camping bags, including a contoured draft collar and insulated face gasket that together trapped our body heat inside the bag instead of letting heat out and cold in. A full-length draft tube further insulates iy by preventing cold air from entering through the two-way zipper. We found the bag was close-fitting, which means that once you’re inside, you’ll feel warm fast because there isn’t a lot of extra space for your body to warm up. While the bag is trim, the square foot box is spacious; this means that your feet won’t feel cramped or claustrophobic, which will keep them warmer and help you sleep better. 

The best water resistant 4-season sleeping bag

Exped Waterbloc Pro -15° sleeping bag on grass

The lightest weatherproof down sleeping bag on the market (Image credit: Emily Woodhouse)
The best water resistant 4-season sleeping bag

Specifications

Weight: Small: 2lb 11oz / 1,225g; Medium: 2lb 13oz / 1,280g; Large: 2lb 15oz / 1,340g
Length: Small: 75in / 190cm; Medium: 81in / 205cm; Large: 87in / 220cm
Pack size: Small: 10.6in x 6.7in x 5.9in / 27cm x 17cm x 15cm; Medium: 10.6in x 6.7in x 6.3in / 27cm x 17cm x 16cm; Large: 10.6in x 6.7in x 6.7in / 27cm x 17cm x 17cm
Fill: 800+ cubic inches/oz goosedown
Comfort rating: -6°C / 21°F

Reasons to buy

+
Waterproof
+
Storm flap on zip
+
3D foot box

Reasons to avoid

-
Question marks over temperature rating

The Exped Waterbloc Pro sleeping bag is a 4-season sleeping bag designed with bivying in mind. It has 800 fill down, making it very soft and warm, with a Pertex outer shell that repels the weather. Although it is sold as waterproof in some marketing material there is also a disclaimer that you obviously can’t lie out in a downpour and expect to stay dry. Not that you want a completely waterproof sleeping bag anyway – that’s what bivy bags are for and a zero breathability sleeping bag sounds like a sticky night’s sleep. Nevertheless, our expert tester thinks that "Exped have gone out of their way to make this sleeping bag as water resistant as possible." We found that the entire outer shell has barely any seams, meanwhile the zip has a Pertex storm flap and the 20D Pertex Quantum Pro has a 1000mm water column. 

In terms of comfort, we found it was a very lofty sleeping bag with lots of attention paid to keeping unwanted cold air out. The one question is on the actual temperature ratings. It’s called a -15° sleeping bag but the comfort, limit and extreme temperatures listed on the website are different (warmer) to those printed inside the bag. And surprisingly none of those numbers are -15°.

Read our full review of the Exped Waterbloc Pro -15°

The best value down 4-season sleeping bag

OEX Leviathan EV 900 sleeping bag on grass outdoors

A down-filled 4-season sleeping bag that promises big things for a comparably low price tag (Image credit: Craig Taylor)
The best value down 4-season sleeping bag

Specifications

Weight: 1,370g / 3lb
Pack size: 19.3in x 23.6in / 49cm x 60cm
Length: 220cm / 87in
Fill: 900gsm / 600 fill power duck down
Comfort rating: -9°C / 15°F

Reasons to buy

+
Reasonably priced
+
Packs down small
+
Quite light
+
Very cosy

Reasons to avoid

-
Only comes in one (nasty) color
-
Temperature ratings are slightly generous

The Leviathan EV 900 is a solid 4-season sleeping bag with an impressively low comfort rating for the price. Ideal for winter, it has a comfort rating of -9°C (15°F) and comes stuffed with 900 grams (30 ounces) of hydrophobic 600 fill power ethically sourced duck down, while the shell is made from 20D nylon. Featuring a thick baffle along the length of the side zip, as well as a huge baffle and lofty hood around the top of the bag, it’s built to keep you warm in colder climates – and in our tester’s experience, it did just that. 

Weighing 1,370g (3lb), the Leviathan 900 is also reasonably lightweight, considering the temperatures it is designed for. And while there are bags out there that will deliver an equivalent level of warmth at a fraction of the weight, our expert tester insisted "there’s simply no beating it at this price point." We do think the temperature ratings are a little generous, and that to get any sleep at -9°C (15°F) you would need some serious base layers on.

Read our full OEX Leviathan EV 900 sleeping bag review

The best 4-season sleeping bag for sustainability

4-season sleeping bag: Patagonia Fitz Roy Down Sleeping Bag

High-end, eco-conscious and warm sleeping bag for backpacking in all seasons (Image credit: Kim Fuller)
The best 4-season sleeping bag for sustainability

Specifications

Style: Baffled, down sleeping bag
Shape: Mummy
Temperature rating: -7°C / 20°F
Weight (regular): 1,021g / 36oz
Length: Suitable for users up to 183cm / 6ft (Short is suitable for users up to 168cm / 5ft 6in; Long: 198cm / 6ft 6in)
Filling: 800-fill-power certified traceable down
Materials: Shell and Liner: 100% recycled nylon ripstop with PFC-free DWR finish
Compatibility: 4-season camping
Zip options: Central
Colors: Blue

Reasons to buy

+
800-fill-power down is very warm and lofty
+
Three lengths available
+
Hood design is like a jacket for ideal fit
+
Sculpted footbox keeps feet extra warm
+
Internal chest pocket keeps essentials warm and accessible
+
Water-resistant shell
+
Eco-conscious with Advanced Global Traceable Down, 100% recycled and solution-dyed fabrics, and Fair Trade Certified sewn

Reasons to avoid

-
Central zip won’t suit everyone
-
One of the pricier sleeping bags on the market
-
This bag is heavier than ultralight backpacking options
-
Pack sack could offer more compression support

This down sleeping bag from Patagonia is named after the region's most famous mountain: Mount Fitz Roy (properly known as Cerro Chaltén), an astonishing peak on the border between Argentina and Chile. It's a high-end option designed for use in cold weather conditions. The bag is filled with 800-fill-power Advanced Global Traceable Down, which is ethically sourced and provides excellent insulation. 

One of the key features of this sleeping bag is its vertical baffles – this design helps to keep the down evenly distributed throughout the bag and prevents cold spots from forming. 

We found it was also packable and works well for trekking in the backcountry, but it is not the lightest and most compressible option. Overall, the Patagonia Fitz Roy Down Sleeping Bag is a high-quality option for camping in cold weather conditions. While it is more expensive than some other sleeping bags on the market, our expert reviewer insists that "its advanced materials and features make it a worthwhile investment to ensure you’ll be camping comfortably."

Read our full Patagonia Fitz Roy Down Sleeping Bag review

The best value synthetic 4-season sleeping bag

best 4-season sleeping bag: Snugpak Softie Expansion 5

A luxurious feeling synthetic sleeping bag that punches way above its weight considering the price point  (Image credit: Alex Foxfield)
The best value synthetic 4-season sleeping bag

Specifications

Weight: 2.3kg / 81oz
Length: 220cm / 87”
Pack size: 32cm x 26cm / 13" x 10"
Fill: Polyester Softie insulation
Comfort: -15°C / 5°F
Limit: -20°C / -4°F

Reasons to buy

+
Plush, luxurious and warm
+
Great for winter camping
+
Can regulate temperature with expander panel
+
Retains thermal qualities when wet
+
Great value

Reasons to avoid

-
Very heavy
-
Larger pack size than most

Snugpak’s polyester Softie insulation has been a mainstay in the British brand’s products for over thirty years. It utilizes superfine yarns bound together with special resins to mimic the properties of natural insulation such as down. The result is what our expert tester calls "a really plush feeling bag," one that's easily warm enough for winter camping trips.

We found that this bag is a gloriously cozy cocoon to nestle within and, with a comfort limit of -15°C (5°F), it is wonderfully toasty in all but the most Baltic conditions. However, it's limited to sub-zero use, as its elasticated expander panel allows the user to open things up, thus regulating the temperature inside.

As its fill is synthetic, it's not as light or packable as many of its down-filled counterparts and we found that it wasn't ideal for long backpacking missions. However, it’s a mere fraction of the cost of some of the leading down bags. Great value then, especially considering its luxurious feel and the amount of warmth it retains.

Read our full Snugpak Softie Expansion 5 review

The best cheap 4-season sleeping bag

4-season sleeping bags: Mountain Warehouse Microlite 1400 Winter Sleeping Bag

A seriously warm synthetic sleeping bag available for a bargain price (Image credit: Pat Kinsella)
The best cheap 4-season sleeping bag

Specifications

Style: Synthetic fill backpacking bag
Shape: Mummy
Temperature rating: Comfort: -4°C/25°F ; minimum: -11°C/12°F
Weight (regular): 1,900g / 67oz
Length: Regular: 200cm/79in (max user height 180cm / 5’9”); Long: 215cm/84.5 (max user height 195cm / 6’4”)
Pack size (regular): 20cm X 44cm / 8 x 17in
Filling: Synthetic microfibre (100% polyester)
Compatibility: cold weather camping, backpacking or car camping
Zip options: Left or right
Colors: Blue or burnt orange

Reasons to buy

+
Warm enough for 4-season camping
+
Retains thermal properties when damp
+
Left/right zip options
+
Well featured 
+
Excellent price
+
Easy to look after

Reasons to avoid

-
No recycled content
-
Not as lightweight or compressible as down 
-
Not as comfortable as down

Four-season sleeping bags don’t have to cost a fortune, as this excellent offering from Mountain Warehouse proves. The microlight 1400 might not be as featherlight, packable or quite as sumptuous feeling as down-filled sleeping bag, but it is certainly light enough to be taken on backpacking adventures, and was more that capable of keeping us warm in the conditions we encountered on test, the sort that you'd likely encounter during the vast majority of the year in non-alpine terrain. Our expert tester said that it's "perfectly suited to those early spring camping escapades," when days are getting warmer but nights can still be super shivery if you don’t have the right gear. And it is very reasonably priced.

Available in versions to suit left or right handed people, the two-way zip can be opened from the bottom or top (to give you ventilation options) and is backed by a storm flap to keep breezes out. It boasts a good, shaped hood, which can be pulled tight around your face, and has inner pockets for keeping valuables safe, or phones warm and handy. It comes in two lengths, regular and long, and the ripstop outer fabric is robust and should last for many chilly seasons.

Read our full Mountain Warehouse Microlite 1400 Winter Sleeping Bag review

The best 4-season sleeping bag for coziness