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  • Western Mountaineering - Alpinlite Sleeping Bag: 20 Degree Down - Cranberry

Western Mountaineering Alpinlite Sleeping Bag: 20 Degree Down

$570.00 - $600.00

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    • Cranberry


    45 Reviews


    Low weight rules in the big mountains.

    Climbing or traversing technical pitches with a massive load dangling behind you is a bad way to go through life. Western Mountaineering created the Alpinlite 20-Degree Down Sleeping Bag for alpine climbers and weight-obsessed backpackers who demand top-shelf quality and bottom-line weight savings. Its 850-fill down insulation boasts some of the highest quality loft-to-weight ratio around, meaning it's surprisingly warm for how little it weighs. Western Mountaineering wrapped this insulation around a highly breathable shell to keep the down light and lofty when you're sleeping in a tent under a rainstorm.

    • Ultralight sleeping bag designed for alpinists and backpackers
    • Breathable shell fabric keeps down lofty
    • 850-fill down provides a high warmth-to-weight ratio
    • Continuous baffles and a down-filled collar prevent cold drafts
    • Wider shoulder girth allows for extra layering in cold environments
    • Western Mountaineering bags are made in the USA
    • Item #WES0041

    Tech Specs

    850-fill down
    full-length YKK #5
    Max User Height
    [short] 5 ft 6 in, [regular] 6 ft, [long] 6 ft 6 in
    Shoulder Circumference
    [short] 63 in, [regular] 64 in, [long] 65 in
    Hip Circumference
    [short] 56 in, [regular] 55 in, [long] 56 in
    Foot Circumference
    [short] 39 in, [regular] 39 in, [long] 39 in
    Fill Weight
    [short] 17 oz, [regular] 19 oz, [long] 21 oz
    20 F
    Storage Sack
    Stuff Sack
    Claimed Weight
    [short] 1 lb 13 oz, [regular] 1 lb 15 oz, [long] 2 lb 1 oz
    Recommended Use
    backpacking, alpine
    Manufacturer Warranty

    Tech Specs

    • Reviews
    • Q & A

    What do you think about this product?

    Have questions about this product?

    King of the Mountain

    • Familiarity: I've put it through the wringer

    The needs of the backpacker are many, and often unreasonable. This bag weighs 2 pounds and for comparison some other things that weigh about 2 lbs include a small bag of rice, maybe a carton of milk, a desk lamp. For that little weight you get what is in my opinion, the best sleeping bag on the market.

    What makes this bag stand out? First off, the brand name carries all the accolades and associations it deserves. The sourcing (ethical sourcing with audits twice a year), water repellency, and hands on/in house processes are second to absolutely none. My bag's even signed by the person who stitched it (thank you by the way).

    The 850-fill down (a conservative estimate) kicks in like a human tortilla sized toaster oven. It is a 2lb space heater. Up to the draft tube and cinchable collar, this is a cloud of down designed to make sleeping while camping nicer than a night in your own bed. This is a gift to your camping buddies too! I don't think it would be possible for me to wake up grouchy or unsociable after a night's sleep in this. The only downside is the willpower I have to muster up to leave my portable sleep machine.

    It's the little details that step this bag up from your typical bag to something like a best friend would make for you given unlimited time and resources. The 20 degree rating is conservative. I run warm but I was very comfy in this bag at 7 degrees with the right liner and sleeping pad (PS please invest in your whole sleep system when you're out camping). The zipper simply does not catch. They're reliable and easy to use. I had to do some research on the abilities of the benefits of a continuous baffle and I thought WM's site put it best "On a warm night slide down below you for less insulation, and on a cold night slide more to the top for warmer sleep!" Works just as advertised based on a warm California trip and a cold Oregon one.

    I owned, or put up with rather, exactly one sleeping bag before the Alpinlite and I dealt with many of the stereotypical downfalls of a cheap sleeping bag - made with synthetic material rather than down so it couldn't pack as well and weighed more than it should. The zipper caught. Poor warmth compared to the temperature rating. I've tried out and borrowed at least a half dozen other bags without being blown away by any. After much, much, probably too much research I decided on the Alpinlite as a buy once, cry once panacea to my outdoor needs.

    My inaugural trip with this bag was a 2 day trip up to King's Peak. This gift to lovers of the outdoors was toasty, wide, and like the embodiment of a warm hug. It hardly takes up any space in my pack and the weight is negligible. I knew immediately I’d made the right purchase.

    The price tag will undoubtedly through people off, as it did me initially. A season in though, I feel I've gotten my money's worth and more. The quality of sleep, warmth, and the care that went into construction are simply undeniable. This is an outstanding bag that I’ll be using for many years to come.

    King of the Mountain

    Best Bag On The Market!

    • Familiarity: I've put it through the wringer

    In my personal opinion this is going to be the best sleeping bag that you can get yourself! It covers a versatile range of temperatures from warm to cold. This sleeping bag is going to be your go to for the majority of your camping nights. Although I would not grab this bag for a winter high alpine adventure where temps would be well below 15 deg F. But lets be real, how many of these nights do you have a year? very few to if at all any. I have used this bag on many trips and it still preforms like day one! Western Mountaineering uses top quality down that puffs out like no bag I have ever used. It remains just as loffty as when you bought it for years and years! The Capability of this sleeping bag is another great feature. The bag when stuffed is very small and light weight making it ideal for backpacking and realy any trip where room and weight may be an issue. I have taken this bag backpacking down the west coast of Canada multiple times, taken it across Utah's own Uinta mountains, packed it on the back of my dirtbike on a moto camping trip to mexico. Alright I'm sure you get it by now, this is a fantastic bag for most conditions. With Western Mountaineering that is not enough they can still do better, This leads me to the small lesser noticed things about the bag. One of the biggest things I have experienced is the zipper. We all know how frustrating zipping and unzipping bags can be. It seems the process is never easy or goes smoothly. Western Mountaineering has eliminated that on this bag. I have never had the zipper catch on the bag when using it. I preforms as designed EVERY TIME, even in the most rushed situations like when nature calls in the middle of the night. If i could only have one sleeping bag it would be this one! It doesn't matter if its hot you can unzip and use as a blanket and when it gets cold you can zip it up and be fully encased in warmth. This leads me to another point this bag says 20 degs, With other companies a 20 deg bag means your getting cold around 20 degs but still survivable. With Western Mountaineering you are Fully comfortable at the 20 Deg rating. I can't think of a night that I have spent cold in this bag and that includes waking up with frost on it! I highly recommend you spend the extra money on this extremely high quality piece of gear that is designed to last you for many years to come. I will never go back to any other sleeping bag besides Western Mountaineering, You will not be disappointed!

    Best Bag On The Market!

    Western Mountaineering, the best

      If you read reviews on any WM bag, its virtually unanimous that everybody loves their bags. The minute negatives I've read don't make sense from my personal experience. No matter what your needs are in a sleeping bag, WM has a bag with the dimensions, warmth and weight that you want. I just recently received a 6'6" AllpineLite, the ninth Western Mountaineering bag that I've purchased from I don't seem to be able to get enough of their awesome sleeping bags and down clothing.
      I haven't used the Alpinelite yet but I've looked it over and laid in it and it is absolutely another WM work of art. The Extremelite shell and the taffeta lining are silky smooth. The full collar and the draft tube are plump full of down, the zipper operates flawlessly with no snags. The continuous baffles to be able to shift down between top and bottom to suit the temperature you're sleeping in as I've done so many times in some of my other WM bags. The reverse differential hood surrounds your head in a cloud of down without having to be cinched tight. The seams are flawless. It's airy light and lofts like crazy. WM bags are made in the USA and their customer service is outstanding (a friend ripped the lining in my Sequoia and the repair WM did was like magic). I just can't imagine what else I could want in a 20 degree sleeping bag. Oh and the Cranberry color turned out to be really cool! Can't wait to use it!
      I'm 6'2" and fit in my 14 year old son's 6'0" MegaLite but with no room to spare. Although maybe not quite as thermally efficient, I buy the 6'6" bags for that little bit of extra room for drying damp clothes in the foot and for the comfort of being able to move around easily.
      Western Mountaineering bags are expensive but if you spend much time in the back country in a sleeping bag, you'll never regret forking out the cash for one (or more!) of their bags!

      Western Mountaineering, the best

      Review by Charlie Forsythe

      • Familiarity: I've used it several times

      I am very happy to have this sleeping bag. I am a cold sleeper but this bag has worked for me at 20 degrees nicely. At 5 degrees I was definitely feeling the coldness through the bag but that is not what this bag is designed for. In the summertime this bag is so great. My time with it has mostly been around 44-47 degrees latitude (~-115-123 longitude) and I sleep so comfortably in it. I really love how small it compresses down to. It is great to have my sleeping bag be around the same size as my other gear and not overwhelming the space in my backpack since. I have plenty of shoulder room (I’m 6’2, 215) and I feel that I have plenty of foot space too, so my feet aren’t feeling constrained either. Also, the inside is very smooth and feels nice and it is not itchy or abrasive.

      Quite simply the best!

      • Familiarity: I've used it several times

      I ordered this sleeping bag a month or so ago and have used it in 18 degree weather. I slept very warm and comfortable. The craftsmanship is exceptional . Every stitch perfect and hand signed off on by the people who made it. Western Mountaineering is an example of classic “ American Made “ excellence. Emphasizing - it can be done. Thank you for an outstanding piece of gear.

      Best Sleeping Bag Out There

      • Familiarity: I've used it several times

      Western Mountaineering and Feathered Friends are the two manufacturers of premium bags. The problem is choosing the appropriate bag. Feathered Friends offers too many choices. Western Mountaineering has many, but this bag is the all purpose three-plus season bag.
      I’ve used it in the warm Grand Canyon and in the cold at 10,000 feet. Works everywhere for me. Nice/comfortable material, high 850 fill loft, very light, ample interior room (not claustrophobic), compresses to nothing. One cannot ask for more in a sleeping bag. Look no further.

      Top Notch Bag that keeps you warm

      • Familiarity: I've put it through the wringer

      I bought this bag as a splurge in preparation for doing the JMT. While not cheap the weight, pack-ability and most importantly warmth are unparalleled. This bag is warmer than cheaper synthetic zero degree bags that I have. This thing will truly keep you warm at 20 deg. These bags may not have all buzz words of the new bags from the big outdoor brands. But, they get the job done like it's nobody's business.

      If you have the extra cash laying around to get one, do it!

      Great Sleeping Bag

        Western Mountaineering makes the best sleeping bags and they definitely delivered with Alpinlite. It is light weight and it packs really nice. I took it on a 3-day trip in the Sierras and temps were about 8-10 at nights. I was wearing SmartWool base layers and I used a liner and I was happy. When you're buying this product make sure you choose the right sleeping pad. Very important

        Not warm

        • Familiarity: I've used it several times

        After freezing again last night I am sadly writing this review. Last night was in the mid to upper 30s with no wind, I was in a floorless teepee style tent, with a inflatable full length sleeping pad wearing mid weight synthetic top and bottom base layers. I was freezing all night. I have a 25 year old Marmot down bag that always keeps me warm in similar and colder conditions. It weighs a little more and has less room which is why i spent $600 on this bag. The WM bag is light, well made and very comfortable, but I wouldn't use it below 45 degrees. I don't want to have to wear a puffy coat in my bag at night. I spent a lot of nights in a sleeping bag and wanted this one to work but it does not for me.
        My girlfriend has a WM 10 degree bag and always wears a puffy in it when temps are in the 30's. disappointed.

        Is there blood circulating through your body?

        If this bag only kept you warm down to 40 degrees I'd say... probably not. I used this exact bag for 20+ nights last winter here in the Northeastern US. The average temp I used this bag in was 5°F, and many of those nights were "cowboy camping" in the White Mountains, where the windchill easily brought the temp below zero.

        Yes, I did wear basic midweight base layer top+bottoms, an R100 fleece pullover and sleep booties when it really dipped into the low temps, but your proposed rating of 45° degrees for this bag is sort of ridiculous... This thing is GENEROUSLY rated at 20°


          This bag is sweet. Quality, durability, and warmth have made it the best bag of this range that I’ve used. I’m 5’11” and the 6’ bag fit me perfect. I should have bought one sooner.

          This is a great bag!

          • Familiarity: I've used it once or twice and have initial impressions

          I’m 5”11 185 lbs with broad shoulders and the 6 foots fits me perfect. I had plenty of room even wearing a down jacket. I used it on a portaledge with a bivy and it kept me pretty warm despite the 20 degree weather and wind. Had a hard time crawling out in the morning it was so comfortable. I’m excited to take this bag out for more adventures.

          Great work WM, this bag is spot on!

          • Familiarity: I've used it once or twice and have initial impressions

          As age and injury have crept up on me, so has the challenge of adapting to my outside endeavors. Out of five of the 15-20 degree bags I have owned over the last 25+ years the Alpinlilte sits at the top of the list.

          I was able to test this bag on a recent bikepacking S24O in the Manti LaSal mountains of Central Utah. At 8000+ feet the temps got down into the low-mid 30's.

          I'm 6'1" 190lbs with fairly broad shoulders; the 6' size fits me comfortably while still maintaining its efficiency. My morning socks, glove liners and a small electronics ditty bag had enough room to stay out of the way while I slept. The plush foot box maintained warmth better than any of my past bags and left me confident this bag will outperform any of my older bags down into the 20's.

          I'm looking forward to putting it to work on a fishing trip in the near future.

          Great work WM, this bag is spot on!


          • Familiarity: I've used it once or twice and have initial impressions

          I've been eyeing this bag for a number of years now and finally pulled the trigger. I'm way happy I did so, too. Super lightweight and packable. Really warm for how light it is too. I only tried out on a colder night inside, so nowhere near the 30 degree low temp rating. I am excited to put it to the test in some higher alpine camps later this summer. This one is a little bigger and heavier than the UltraLite. I do not mind the extra couple ounces to get the shoulder room.

          Perfect 3 Season Bag

          • Familiarity: I've put it through the wringer

          I have been using Western Mountaineering bags for years and can confirm that they are unmatched in regards to quality and performance. When you buy a "made in the USA" WM bag, you are investing in a bag that will keep performing year after year. In fact, if the bag ever starts to lose it's loft, WM will re-stuff the bag for a nominal fee.
          The Alpinlite really fits the bill if you are looking for One 3 season "comfort" option. I say comfort, as WM also offers the Ultralite, which is the same but more narrow(59 in shoulder circumference vs 64 in at a 2oz weight savings and a slightly lower fill weight). It legitimately will sleep comfortably at 20 degrees and regulates temp. extremely well thanks to a breathable shell and continuous baffling. The weight and ability to compress make it an ideal choice for thru-hikes, bike packing, alpine climbing, or any other activity where weight is a premium and performance is mandatory.

          Unmatched Construction

          • Familiarity: I've put it through the wringer

          WM products are made with some serious quality. Everything I own form them is well above similar products Ive used from their competitors. This is my go to backpacking bag. It fits in a small compression sack and takes up very little space in my pack. Ive got nothing bad to say about it. No cold spots, great zippers, and excellent stitching. The flat spots near the zippers are a great touch to keep them from getting hung up on material as well. I've used this thing a ton and it still looks great and appears it will last forever.

          The sleeping bag version of a Lexus!!!!

          • Familiarity: I've used it several times

          I'm training and preparing to do the A.T. next year and so I've put a lot of time and research into gear- including sleeping bags. I bought one last year that was synthetic fill, but weighed more than it should have for being $180 +. I struggled with justifying the purchase of a $600 sleeping bag, but I tried to remember that if I did not sleep well, my performance and chance to succeed on the A.T. would decrease. I paid the money for this sleeping bag with great trepidation. However, I LOVE this sleeping bag. Legit- I slept on my living room floor the day I got it (over achiever I know). It is very comfortable, and VERY well made. It compacts small and weighs next to nothing. I'm very pleased with this sleeping bag. I've taken it on two overnight trips so far (temp around 15-20 degrees) and this bag kept me plenty warm. I think this is the best purchase I've made on my gear thus far. I'm taking it on a few more trips this month but I'm sure it'll perform just fine.

          Anyone looking for a HIGH quality sleeping bag, you can't beat this. This is as close to a Lexus as I'll ever get. I love this sleeping bag.

          Awesome bag!

            Western mountaineering bags are extremely well built and you get what you pay for. I use this bag in all weather and can regulate my body heat perfectly. I had mine over stuffed which I contemplate if it was necessary but love it all the same. Loft, warmth, light weight and never snag zipper is just about all I can ask for in a sleeping bag.

            Amazing first impression

              I picked this bag up after lots of research, looking for the right bag for me that would have the most longevity. I settled on the Alpinlite for its comfort and versatility. I took this out over the weekend into the Olympic National Forest. It didn't get too cold so I can't talk much about warmth, but I'll say it was extremely comfortable and had plenty of room. I was able to roll around onto my side and belly without being constructed or binding up the bag. I'm 6'1 170lbs and got the 6'6" model.

              How small does the large pack down to?

              What is the weight for this sleeping bag?...

              What is the weight for this sleeping bag? The weight is listed on the Western Mountaineering website as 1 lb 15 oz for the regular, not 1 lb 3 oz as shown here.


              Unanswered Question

              From OutdoorGearLab: "Some of the smallest...

              From OutdoorGearLab:

              "Some of the smallest premium companies, such as Western Mountaineering, source the highest down from geese that aren't live-plucked or force fed; they collect naturally shed down from molting. Some vegans might consider avoiding down down products or purchase them from a company such as Western Mountaineering, that guarantee no harm to animals."

              Can anyone confirm this? I didn't find anything about it on

              I am trying to decide between the Alpinlite...

              I am trying to decide between the Alpinlite and Ultralite. I am a side sleeper and toss and turn throughout the night. Avg build guy at 5'9" 160 lbs. Which would you recommend?

              Do you prefer a little more room for tossing and turning inside the bag or for the bag to move with you as you toss and turn? If you prefer inside the bag, go Alpinlite. If you want the bag to toss and turn with you, Ultralite.

              You'll fit fine in both, but the Ultralite is a true mummy bag and the Alpinlite will be a little more roomy but have more internal "dead" space to heat up--so it'll have more down and more fabric and be an ounce or two heavier...

              Thanks for the quick responses. I normally am a warm sleeper so the empty space is okay. I prefer to have the room when I do toss and turn. The true mummy would be a little to compact I guess. Thanks looks like I will go with the alpinlite.

              If im going to buy an waterproof compression...

              If im going to buy an waterproof compression sack as well, how many liters should i get it in?

              Yeah, O4F hit that right. In say something like the Sea to Summit eVent Dry Sack, I would definitely go with the Small size (10-3.3L). Rule of thumb with comp sacks and sleeping bags- start with the original stuff size, let the straps do the work and compressing for you. Hope that added to the conversation.

              The weight on this bag is incorrect, that...

              The weight on this bag is incorrect, that must be the fill weight.

              I am 6' exactly, should I go with the long...

              I am 6' exactly, should I go with the long or would the Reg. be ok?

              Best Answer

              Hey Spencer,

              I'm 6'-0" and own an Alpinlite. You can pull off a regular, but I prefer the 6'-6" model. I tried both sizes out before I bought, and the reg left me feeling short of shoved into the hood and right there with the draft collar. I longer one also gives me the ability to hunker in a little more and to shove some clothes down in the footbox. This is a great bag!!

              ...And for everyone's consideration that has ever measured their height and used that number to determine which bag length is for them- remember that when you measure your height, your foot and ankle are at a right angle. When you sleep on your back, your feet naturally relax into a position of plantarflexion (downward). This can add at least a few inches or more to the amount of length you need.

              you guys have the weight listed incorrectly...

              you guys have the weight listed incorrectly for this bag. It looks like you have the FILL WEIGHT listed as TOTAL WEIGHT.