An important core backpacking gear item, your backpacking sleeping bag needs to be light enough to carry easily, pack small enough as to not take over your entire pack, and most importantly keep you warm and comfortable at night. In this guide we’ll focus on the best backpacking sleeping bags currently on the market by temperature rating.

As this is a backpacking focused article weight of the sleeping bag and warmth to weight ratio will be of a paramount focus here, with down bags ruling the roost. For a basecamp scenario, synthetic bags would be worth consideration. See our guide on down vs. synthetic insulation for more information and background. For the purposes of this article, we will focus on features, weight, and performance.

Best 30F+ & Summer Rated Backpacking Sleeping Bags

This can be a complicated category with many options. Bags in this range can be very light, but early morning hours can be a bit crisp and ample warmth will be appreciated during the night. My pick hands down would be the Zpacks Classic 30 degree sleeping bag. Weighing in at just 14 ounces and going for $440, this bag is made with DownTek 900 fill power water resistant down and is available in 7 different sizes.

Going to a hoodless sleeping bag (I mostly use the Zpacks 20 degree) has changed my backcountry sleeping for the better – now I can turn with the bag, or inside the bag, no matter. Additionally with the zipper on the bottom maximum heat is retained and you have no zipper at the top (leaking the most hot air) no matter if you’re a back sleeper or a side sleeper. In milder conditions above the shoulders just a warm hat works well for me, but if it gets cold at night you can add in an additional goose hood.

Traditional top-tier manufacturers include Feathered Friends and Western Mountaineering. When it comes to Western Mountaineering, they offer a variety of bags in this category, many that don’t have much difference between each other from a big picture point of view. Their MegaLite 30 degree sleeping bag weighs in at 24 ounces and is a nice option if you like more traditional design features. The MegaLite uses 850 fill down and is a wider bag with a passive draft collar that I’ve found is sufficient down to around freezing.

Western Mountaineering bags aren’t cheap – the MegaLite will set you back about $600 – but with proper care these are bags that will last darn near forever. For slimmer users and in warmer conditions one could consider the Western Mountaineering SummerLite (around $500, 19 ounces) – although we’ve found this one starts to take on a chill as temperatures close in towards the freezing mark, it would be ideal for warmer nights.

Both the MegaLite and SummerLite from Western Mountaineering feature a fully baffled construction (the bag is not sewn through to create the baffles – a sewn through bag results in a lighter and possibly less expensive construction but will have cold spots when temperatures drop).

The Western Mountaineering FlyLite is a newer bag that is an option for warmer weather trips – it’s rated to 36 degrees, weighs just ~14 ounces in a standard width, and retails for just over $500. This makes it the lightest fully baffled bag Western Mountaineering offers.

Draft tubes, draft collars, continuous baffles, and so on are not as critical during warmer conditions and their omission can save weight, but I find I've always appreciated these features in the field.

Feathered Friends additionally offers top of the line down sleeping bags including the Hummingbird UL 30 ($550, about 22 ounces). This is a narrower bag (saves weight, more efficient) so keep that in mind, but if you’ll fit, as with Western Mountaineering this 950 fill power down bag is expensive but worth it.

For women Feathered Friends offers their Egret UL 30 ($550, about 24 ounces) with an even narrower cut but in a more women’s-specific shape. Wider bags from Feathered Friends include the Swift UL 30 ($580, about 26 ounces) and the more middle of the road width wise Swallow UL 30 (24 ounces, $570). It will be hard to go wrong with a Feathered Friends bag, so long as you get the right fit.

Another option is the REI Co-op Magma 30 (averaging around 25 ounces, $380) – offered in no less than 9 sizes for an almost custom type of fit, this bag keeps it lightweight via use of an 850 fill power water resistant down, standard features, and you even get an interior pocket. While of all things backpacking a down sleeping bag is one place where I would not try to cut budget, this is one bag that could be considered more in the budget category if you catch it on sale.

Summary: Best 30F+ & Summer Rated Sleeping Bags (and rating F)

Zpacks Classic 30
Western Mountaineering MegaLite (30)
Western Mountaineering SummerLite (32)
Western Mountaineering FlyLite (36)
Feathered Friends Hummingbird UL 30
Feathered Friends Egret UL 30
Feathered Friends Swift UL 30
Feathered Friends Swallow UL 30
REI Co-op Magma 30

Best 20 Degree Range Sleeping Bags

Everything in nature seems to change below freezing, and at these temperatures I find that it becomes more important to consider those extra features like a nice draft tube and hood, with a draft collar being very much appreciated. For me and many others that backpack mostly in mountain terrain, the 20 degree bag gets the most use 3 seasons out of the year. These are your bread and butter sleeping bags, and from my perspective if you’re looking for the best sleeping bag in this category, you’ll likely be looking at the same brands we’ve previously discussed.

Feathered Friends offers their versatile Hummingbird UL 20 (24 ounces, $610) – with the Feathered Friends Egret 20 (~28 ounces, around $610) being a women’s-specific option in this temperature range. These are narrower bags to save the most weight. However, if you like a little more space in a bag as I do, check out the Swallow UL 20 (27 ounces, $630).

In regards to Western Mountaineering, we can narrow this down to the venerable UltraLite 20 degree (29 ounces, $630) – which is your narrow / standard option – and the wider and perhaps more comfortable 20 degree AlpinLite (31 ounces, $710). Although it’s a bit heavier the AlpinLite’s space wins out for me out of these two bags, but as with Feathered Friends, you can’t go wrong here.

That said as previously mentioned and although I have had many a comfortable backcountry night in a WM AlpinLite, my preference for a backpacking sleeping bag has evolved towards the hoodless category. The Zpacks 20 Degree Classic sleeping bag (~19 ounces, $460) is my current choice for a bag in this temperature range – I find at these temperatures a hoodless bag is ideal (so long as I wear the warm hat I already take and wear a jacket with a hood). You can find my review of the Zpacks 20 here, although Zpacks has since updated the bag just a bit with upgrades. Zpacks again also offers their goose hood, but with a warm hat and jacket hood, I haven’t personally needed this until temps fall below 20. That said if you’re not ready to give up your sleeping bag hood, Zpacks also offers their 20 degree Mummy sleeping bag (23 ounces in medium standard, $580) with a built-in traditional hood.

When on sale, for a more budget option in this category we’ll go ahead and put the REI Co-op Magma 15 in this category (comfort limit: 21 degrees). With a weight of around 36 ounces depending on size and retailing at $429 full price, this bag offers a very reasonable weight in 9 different sizes for a tailored fit, and at a very reasonable price especially if you catch it on sale.

Summary: Best 20 Degree Range Sleeping Bags

Feathered Friends Hummingbird UL 20
Feathered Friends Egret UL 20
Feathered Friends Swallow UL 20
Western Mountaineering UltraLite (20)
Western Mountaineering AlpinLite (20)
Zpacks 20 Degree Classic
Zpacks 20 Degree Mummy
REI Co-op Magma 15

Best Winter and Cold Weather (Zero and 10 Degree) Sleeping Bags

I find that it’s more versatile to have 2 warmer rated bags, combining them to form a winter sleep system when needed for cold winter trips rather than keeping a bag from this category on hand. As an example, I’ve combined a 20 degree and a more summer-oriented bag and stayed warm (with appropriate sleeping pads and a total r-value for the temperature) on winter trips nearing minus 20F. That said if you have one 3 season bag that covers all seasons other than winter, sleep especially cold and want a warmer bag for 3 season mountain trips, or are looking to add in a dedicated winter bag, a bag in this category may be desired.

Same players, different temperature ratings again here. The 2lb., $735 Western Mountaineering VersaLite 10 degree sleeping bag is a solid choice on the warmer end of this category. One nice thing about the Versalite is that it’s in the middle width-wise – just right. Going back a bit to their 20 degree options if the UltraLite was a bit too tight, and the AlpinLite a bit too wide, the VersaLite will likely be a perfect choice.

For a women’s-specific bag check out the 10 degree Feathered Friends Petrel UL 10 (2lbs, $660). This is a super high quality women’s bag that is not unheard of on packing lists even for summer trips in the mountains for cold sleepers. As a women’s bag I haven’t personally used the Petrel, but having seen this bag being used in the field on many occasions I’m never surprised by the loft of Petrel – you may need a bigger pack!

At these temperatures I do think a sleeping bag hood is something good to have – you want to retain every bit of heat your body puts off during the night within a singular compartment and bag. Thus the 28 ounce, $600 Zpacks Mummy Sleeping Bag in a 10 degree would be well worth consideration here for hikers looking to save weight.

On cold winter trips, I prioritize warmth and features over weight.

The colder it becomes the less I am personally concerned about weight – I prioritize warmth and comfort – and the last thing I’d want is a constricting bag on a winter night that could last 16 hours or more. In their wide mummy series the Feathered Friends Raven 10 UL (34 ounces, $700) would make for a top of the line choice in a 10 degree bag, but if saving the weight is more critical (via less width), the Feathered Friends Lark 10 UL (31 ounces, $680) would be the next logical choice here.

Pushing the rating to 0F Feathered Friends offers their women’s Murre ES 0 degree bag (3lbs, $780) as well as their Ibis ES 0 Degree (50 ounces, $820). With a focus on heating efficiency, both of these bags have a bit of a narrow cut to be aware of – as with many things, there are pros and cons.

Summary: Best Winter and Cold Weather Sleeping Bags

Western Mountaineering VersaLite (10)
Feathered Friends Petrel UL 10
Zpacks 10 Degree Mummy
Feathered Friends Raven 10 UL
Feathered Friends Lark 10 UL
Feathered Friends Murre ES 0
Feathered Friends Ibis ES 0

Deep Winter / Expedition Sleeping Bags

While I prefer to combine 2 bags to make a poor man’s expedition bag for general winter backpacking trips in the lower 48, if I were to plan an Arctic expedition, a cold mountaineering summit attempt, or for some type of cold northern basecamp type scenario, an expedition bag would certainly be appreciated in these unique circumstances.

Feathered Friends and Western Mountaineering offer some very intriguing, and impressive, choices here that both throw plenty of goose down at the issue. The Western Mountaineering Bison Stormshield (69 ounces, $1360) is rated to -40F with 10” of loft and a weather-resistant shell. This bag is sized generously for additional comfort on those long winter nights.

On the Feathered Friends side, their -40F solution can be found in the Snow Goose ES -40 (65 ounces, $1170). This bag is another bag that’s sized generously for more comfort and space if you’ll be spending a lot of time in your sleeping bag. If -40F isn’t warm enough however, the 78 ounce, $1360 Snowy Owl ES -60 bag from Feathered Friends may be up your alley for the most epic of arctic level expeditions.

Summary: Deep Winter / Expedition Sleeping Bags

Western Mountaineering Bison Stormshield (-40)
Feathered Friends Snow Goose ES -40
Feathered Friends Snowy Owl -60

Whether it's an expedition sleeping bag rated to 60 below or a featherweight summer bag that packs up smaller than a water bottle, there is a sleeping bag on the market for every possible use and scenario.

In Conclusion

A critical item on your gear list, there are a few ways to go about your sleeping bag strategy. You could choose to go with a bag rated for the lowest temperatures you’ll ever backpack in, but this bag may be overly bulky and heavy for warm summer trips (albeit workable). To save weight, I like to go with a 2 bag system, a warmer bag for downright summer-like weather, and a 20 degree bag that gets the vast majority of use for 3-season trips in the mountains where lows in the 20s are not uncommon in August. When I head out on a winter trip, I combine them.

Whether you opt for a 1 bag approach or a multitude of bags ideal for every scenario, sleeping warm adds to any trip – and while a slightly heavier and warmer bag may not rule the ultralight spreadsheet, some temperature rating buffer is always appreciated at night when you’re out there.

For a list of sleeping bags from various manufacturers that you can sort and filter by temperature rating and more, see this page at REI Co-op. For background info on sleeping bags, refer to our guide on How to Choose the Best Backpacking Sleeping Bag.

For additional related “big 3” and “big 4” gear selection, take a look at our articles: Choosing the Best Backpacking Sleeping Pad as well as Best Backpacking Backpacks by Category, and Best Backpacking Tents by Application and Budget.