Not just lite; MegaLite.
- Ultra-premium, 850-fill down insulation to retain your body’s warmth and maintain a super-high warmth-to-weight ratio
- Ultra breathable, packable, high-thread-count ExtremeLite shell fabric encases the insulation without adding unnecessary weight
- Water-resistant coating protects the down insulation from frost, condensation, and spin drift
- Continuous baffle system ensures unimpeded loft and and zero cold spots
- Slightly wider shoulder and waist circumferences ensure a comfortable night sleep
- Full-length, #5 YKK coil zipper stands up to years of use
- Western Mountaineering bags are made in the USA
- Item #WES0042
What do you think about this product?
October 31, 2019
Great 3 season bag
This is phenomenal for a three-season bag for most of the US. With Western Mountaineering using a 20D Microlite XP fabric in all of its ExtremeLite series you know that this bag is going to be super light and durable. 20 Deiner fabric is the perfect blend of lightness and durability, which is why Western uses this fabric. The Microlite XP fabric is a super high thread count making it very water-resistant while remaining in the featherweight category. Along with this Crazy-light fabric Western pairs, this bag with an 850+ fill power down which is RDS approved. In reality, westerns down are the highest on the market, you may see brands that boost a fill power of 900+ which is what westerns truly is. In most tests that Western does with there down it exceeds the test, the reason for the 850+ is because in real-world situations and not in the lab where it's tested it's going to perform as an 850 fill. This bag is well worth the price as are all of Western Mountaineerings bags. If you're in the market for a sleeping bag that's going to perform as well as you and that'll last a lifetime this is the bag. At a mear 1 lb 8 oz, this thing is dumb light and way warm for the weight. If you're a cold sleeper this makes a great summer bag as you'll be toasty down to 30*. if you sleep warm and use a sleeping bag liner you can push this bag well below the 30* mark. Westerns temperature ratings are were a women with long johns and a beanie would sleep comfortably. Although in most cases I'd say they're even warmer than that.
November 19, 2019
Thank you so much, Spencer! Leta Western Mountaineering Rep
October 11, 2019
Can't say enough great things about this bag! Unbelievably lightweight, remarkable quality, and warmth you can't beat. I took this bag on a week-long camping trip through Southern Utah... nights can get very cold in the desert, yet I couldn't even tell when I slept in this incredibly warm sleeping bag. This may be rated as a 30 degree bag, but it performed super well for me even when temps dropped below the 30 mark. Made me one happy camper-- and with the quality of Western Mountaineering, you know you'll be a happy camper for a lifetime.
September 18, 2019
No Frills Quality
If you know have even a passing knowledge of sleeping bags, you know that the Western Mountaineering brand speaks for itself. This holds true to their general brand ethos - simple, bomber, and functional. This packs down quite small, saving space in your pack for supplies on longer trips or allowing you to carry a smaller pack on a quick overnight. I was able to very comfortably pack everything I needed for an overnight in a 30L pack thanks to this bag's excellent compress ability.
August 29, 2019
It's true, WM is the best bag maker out there. I've been backpacking all my life and finally got a megalite last winter for this summer in the Sierra. My only regret is waiting so long to get one. The temp rating is conservative IMO. Can go lower, especially if layering up with clothes. Quality and workmanship is unbeatable. Packs up super tiny and lofts up big time when deployed. Perfect for my intentions which are 3 season hiking thru the Sierra.
July 11, 2019
This thing is amazing. Its so light and compresses down so small, all while maintaining unparalleled performance and comfort. You won't regret it.
July 22, 2018
This bag is so awesome. It is best in the 20-50 degree range, but I'm pretty sure with the right clothing on it would go lower. It packs down to nothing and is super light. The zipper doesn't snag and is perfect.
July 22, 2018
Purely amazing. No matter the climate or the weather I have been in, this bag has me covered. The material is incredibly soft, it's so light you barely feel on the bag on you when sleeping, the zipper has yet to snag, and it's roomy even for a tall guy like myself. It has been worth every penny. After a year and a half this is my go to bag for every trip except in the middle of winter. If I ever need another bag, it will be a Western Mountaineering bag.
April 4, 2018
Been through a lot of bags over the years. This is the finest and only bag I will ever need.
April 12, 2018
John, thank you for a simple and stellar review! Enjoy! Leta Western Mountaineering rep
November 27, 2017
Awesome Summer Bag!!!
I finally broke down and forked out the cash to buy my first Western Mountaineering bag. I specifically bought this as a summer bag. I am 6'2" 225lbs so I ordered the 6'6" length. Had some technical difficulties trying to order it online so I got a hold of customer service.... Tangent- Backcountry's customer service is 5 stars!!! They are spectacular. After primarily shopping at another major competitor with 3 letters in its name and having multiple horrible experiences with their customer service department, I decided to use backcountry as my go to store. In no time at all they got my order processed and on its way. I can not speak highly enough about how helpful and professional the rep was... Only wish I remembered his name, but it was not a fluke, ever since then have had the same experience. Ok back to the bag, Initial impressions- Got the bag in and took it out. No packaging issues. Looked the bag and the stitching over. Again no issues and appeared to be done with great attention to detail. Let the littles ones play with the zipper for awhile as they are my best quality control testers. After my 2 year old ran its through the ringers with 0 snags, the zipper still ran smooth. Crawled in side and found that I had plenty of room to move around with out the bag feeling too loose or to restrictive. Plenty of room in the shoulders and the foot box as I turned over and over as if I was on full spin cycle. I am a side sleeper and tend to toss and turn a lot, first test appeared that this bag was accommodating to my sleep style. I packed it in to my OR 8L dry compression sack. The bag fit in it and compressed down nicely. Left it in there for a day, took it out the next day, and the loft fluffed itself out in no time, no dead spots observed, the bag seemed to regain its loft quick and evenly. First trip was a 3 night trip with night time temps down to low 40's. Slept very warm, 1 night I actually zipped it opened and used it as a quilt with a foot box, which worked quite nicely. Never had any issues with the bottom of the bag over compressing and creating any cold spots. Also did not observe any pieces of down trying to poke themselves out. I was skeptical about the bag material at first, felt like it could rip really easy, but after my initial tests and trips, that fear was quickly put to the wayside. This bag ended up being very tough. All in all, I know it is a lot of money to fork out, but it is worth every penny, I am very happy with the quality of this bag and would highly recommend it as a summer/ early fall/ late spring bag!!!! Brandon- "Make a plan, share the plan, stick to the plan"
April 12, 2018
Thank you for a great review, Brandon! Leta Western Mountaineering rep
September 5, 2016
I bought this bag last spring when I was working for an outdoor gear store and was able to take advantage of a nice discount. It is honestly my favorite piece of gear that I have ever owned. It's incredibly warm (I would say the 30 degree rating is a conservative estimate), light, packable, durable, and comfortable...and the zipper never snags. The water-resistant outer shell fabric absolutely works...just the other night I was sleeping outside, and a fair bit of condensation formed on the bag, which was repelled brilliantly. Obviously the price tag isn't ideal, but all things considered I think it's worth the price. Also, I'm about 6'1", 170 and the 6ft bag is a perfect fit, IMO.
February 25, 2016
What's Not To Love?
A great sleeping bag for us taller/bigger folks who want a roomier version of your standard mummy bag. This is my second MegaLite bag; the first I "lent" to my girlfriend two years ago when we first went backpacking together and I never got it back. I finally broke down and got another MegaLite so she wouldn't be the only one with a top-end sleeping bag. This bag is so warm that 80% of the time I use it as a quilt and am perfectly comfortable - and I'm not an especially warm sleeper. Compare the loft of this bag to other supposed 30-degree bags and it's obvious the MegaLite has more (better?) down. Great loft in this bag. In my mind it's a high-quality, life-time investment! (FWIW, the girlfriend who borrowed my MegaLite is now my wife and I like to think that me lending her my pride-and-joy all those years ago had something to do with that. ;-)
February 26, 2016
Lawrence - GREAT review! and congrats snagging the woman of your dreams with a Western Mountaineering bag! Enjoy!! Leta Western Mountaineering Rep
August 31, 2015
Best Sleeping Bag Brand, Period!
I have owned my Megalite for 10 years. It is the best piece of camping equipment I own. It is incredibly light, packs to the size of a cantaloupe and is even better than advertised from a temperature rating standpoint. This summer I sold mine to a friend and purchase another one right away.
April 13, 2014
My Dream Bag
I loved this thing so much, i ended up getting the kodiak as well for colder trips! I've now had this bag for 5 years though, and I've had no problems at all. I may send it in for some extra stuffing soon, but that's to be expected after close to 6 years of pretty constant use! I didn't really realize how awesome WM is though until I went to shop for a colder weather bag a couple years ago. I actually tried a few other companies over several months (trying to avoid the high WM price tag), but I ended up coming back to this awesome bag company in the end. WM makes a more comfortable bag than other companies with plenty of wiggle room, and they rate their bags' temperatures more conservatively than other companies, which means more warmth! You really can't beat their quality! ...Also, I can zip both bags together with no problems (since one is left, the other right), even though they are different links.
August 16, 2013
Perfect choice to fit my needs
Fwiw, I received my 6' regular Megalite today so, of course, I gave it the once over. . While I didn't inspect it minutely, I saw no noticeable defects in workmanship. The zipper operated smoothly without snags. The material felt nice on the skin. I then tried it on for size. Right now I'm 6'10.5" and 195 lbs with a 42" chest. I wore a base layer with my Golite synthetic vest and Zpacks beanie. I easily fit in the bag at the shoulders and chest with the vest on. I could cross my arms over my chest or leave them lengthwise next to my torso without constriction. The bag also easily fit lengthwise, I had no issues wearing my beanie in the hood, and the draft collar seemed to fit well. In fact it felt like I had about 6" left in the footbox where I could place damp clothing to dry or water bottles without sacrificing foot area. The footbox felt pretty roomy as well without the need to curl my toes. The stuff sack weighed 1.4 oz on my scale. The bag in the sack was 26 oz exactly meaning the bag weighed 24.6 oz. on its own. Admittedly the bag is expensive but I already have confidence it will give me the protection I need while allowing me to manage a lightweight pack. All in all, I know I made the right choice for my needs. Lastly, the purchase supports American workers instead of Chinese. I like that fact a lot.
July 19, 2013
customize your down by sending it in.
this is a high quality sleeping bag if you do buy it and find that you are cold with your 30 degree rating and don't think you are warm enough western mountaineering is a solid company send the bag to them ask them to stuff your bag with a bit of extra down and boost your temp on your bag. i love this bag mainly cause it is so light and with my compression sac i can squeeze this guy in my small light day pack and still have room for the rest of my gear. i bought this cause i was cutting weight from my pack and got all new gear with super light wt in mind. i say get it like i said if it not as warm as you hoped send it in and get a boost of down.
May 3, 2013
Loved the bag in terms of workmanship and materials, but I returned it when I decided that a 20 degree three season bag and a 40 degree summer bag better fit my needs. I replaced this with a WM Alpinlite and a WM Mitylite.
February 24, 2013
WM Megalite wonderbag!
I have been using my 6' mega for 2 yrs and am so pleased with how the temp rating is right on but I have easily pushed the temp rating by wearing long unders. I have put on my down sweater inside it and been too warm so Im not sure where the bottom temp is on that combo.You can only do that because of the generous cut. Buy this bag and feel like a very smart and patriotic outdoorsperson!
February 9, 2013
WM Megalite is for real
This bag is just great. I am 6'2 185 lbs and bought the long size. I am a side sleeper and prefer space inside of my bag; this bag fits my needs perfectly. Lofty, warm, light, and smooth are the four words that sum up its features. I can't believe a bag this spacious actually fits into the included XS stuff sac. I especially love the smooth inside/outside face material, it just feels very soothing to the touch, unlike the Montbell u.l.'s tissue like material. Few people talked about the function of a smooth face material on a sleeping bag, but the smoothness of the inner surface lends itself to allow easier tumbling and turning, without taking the bag with you. My wife and I can even use it unzipped as a comforter, and achieve decent warmth and comfort. It also shows minimum down leakage, which is a serious problem in other bags that I have owned. This is one piece of luxurious equipment that I can honestly say well worth the money.
March 4, 2013
Took the bag for an overnight in Zion NP, the low temp. was in the high 30s. With an uninsulated pad, still no problem at all. Even with all the extra space of the long bag, I didn't feel any cold spot the entire night. I do always wear a light insulated hoodie to protect my head and neck. I am comfortable taking this to its rating as is, and to 20s even high 10s with a good puffy jacket and pants (more than enough space for that in this bag).
April 6, 2013
Just took the bag for another trip to 10000 ft. alpine snow. Low was 29F and windy (inside a single wall tent, good air flow), still good. A little cold when side-sleep, but there's not a fault of this particular bag. Leaning against wife solved the problem. (Is there a side-sleeper's bag?)
October 3, 2012
This is my first WM bag and I'm hooked. Just took it on a 2 night backpacking trip. Super lightweight & compact. I'm a woman, 5'2 and the 5'6" is perfect. It is roomy in the shoulders good if you move around alot at night and/or for warmer temps but not efficient in temps below 40 (I stuffed my extra clothes in the space to make it work in upper 30's) I do like the bag, but because of the roominess, this will be my warmer weather bag and I'll probably get the Apache for more efficiency in cold wx.
August 6, 2012
Simply the best!
I have purchased 4 WM bags over the years and have steered several friends to them as well. They are simply the best sleeping bags made. Superior quality and performance in every way. They are a work of art. I use the Megalite for most of my backpacking, It's just right for 3 season use.
February 1, 2020
Do you know if the Big Agnes Double Z pad would work with this? I’ve had my eye on a WM bag for 5 years and need a sleeping bag now.
April 25, 2019
5’6” or 6’0” feedback request. Hello everyone, I am 5’6” so I’m wondering, when they say max height for the short is 5’6”, would that be head and feet pressed tightly at the ends of the bag, or is the bag larger so someone at 5’6” would still be comfortable? Thank you for your feedback, this is my first serious sleeping bag purchase and after reading many reviews I’m going with the, “Buy once, cry once,” ideology as this seems to be one of the best. Also, as someone that usually shops REI and has the reassurance of their 1-year warranty, does Backcountry support purchases in any way, should this not be the right fit? (I’m sorry if this is a poor question, I have yet to fully search the website). Thank you for all your help!
April 29, 2019
Hi Jacob, It should still feel comfortable and accommodate you being 5'6". Additionally, all the Western Mountaineering products come with a lifetime warranty. If you have any other questions or need assistance with an existing order or placing an order, please feel free to contact us on Chat or call us at 1-800-409-4502. Thanks!
January 18, 2018
Hi, looking at a megalite. My son is getting into Boy Scouts and we will be doing a lot of camping and hiking here in Northern California. Is this the best WM sleeping bag for this activity? Also, I am 5’7” and generally a side sleeper. What size should a get? 5’6” or up to 6’ if I go with the megalite? Many thanks.
January 24, 2018
Hey Anthony, If you are 5"7 you absolutely need the 6 foot bag. As for if this is the best bag or not, i think a western mountaineering bag is definitely a great choice, but i would be nervous about the temp rating on this bag for certain conditions you might experience in NorCal. From my experience, it can often be colder than 30 degrees in the mountains there... so you may want to consider a lower degree bag (maybe a 15) but totally depends on when the troupes will be outside and where! Let me know if I can help more! Best, Brittni
August 23, 2015
Is there a way to attach it to my sleeping pad? At night I always turn around and find myself off the pad
August 24, 2015
Hey Tom, Unfortunately this sleeping bag does not have a way to attach a sleeping pad. I would recommend checking out the Therm-a-Rest ProLite 4 Sleeping Pad (CAS003Z). It features a sticky-dot non-slip surface that ensures your mattress stays put for a full night's sleep.
June 15, 2015
I need more of a summer sleeping bag used for many activities. I am picking between SummerLite or MegaLite where I like addition of top colar on MegaLite and additional down BUT I am not sure about the size. It is wider than SummerLite. How can I know if this will be to big in shoulder area or not. Usually i sleep in base layer. Thanks
June 15, 2015
What is the circumference of your shoulders? Do you move a lot when you sleep? I mean the Megalite will be more comfortable because you have more room but, you sacrifice a little weight. I'd say if you move around a lot go with the Megalite, if you can sleep still on your back the Summer Lite is a good option. Feel free to hit me up at email@example.com or 801-736-6398.
May 21, 2015
Hi, just wondering what the actual length of this bag is in the Long size. I'm just over the height limit at 6'7" and wonder if the length would be too short for me. All other measurements are present except length on their site as well. Thanks
May 22, 2015
Hey there, Leta here with Western Mountaineering. Shoot, this is a tough one. You really need a semi rectangular option, and Western Mountaineering does make a bag that I think would work: a 6'6" Alder at 25 degrees. It's semi rectangular, no hood, which is what you would need. The only 7'0" options we have are starting at 15 degrees and colder. The Gear Heads at Backcountry.com are awesome about special orders. They will take good care of you! Hope this was helpful, Leta
April 1, 2015
Sleeping bag liners and pads to recommend. I just got my 6'-6" Megalite and am trying to figure out what liner and pad would work best with this bag? I am a side sleeper! Thanks, Ben
April 7, 2015
Hey Ben, There are a whole bunch of options. How important is weight to you? What type of R-value are you looking for in the sleeping pad? What type of trips / area will you be taking this set up to. Feel free to email directly and I can work with you 1-on-1 Jared D. Expert Gearhead 801.736.4336 firstname.lastname@example.org
May 25, 2014
Hello Does the megalight open fully into...
Hello Does the megalight open fully into a blanket like the terralite? Or does it zip down one side to the feet, which remain enclosed? Many thanks
May 26, 2014
The latter of the two possibilities: this bag zips down one side to the feet, which remain enclosed. Hope this helps.
June 2, 2012
Do you guys every plan on getting the 6'...
Do you guys every plan on getting the 6' version in stock??
June 2, 2012
Your best bet for a quick answer to stock questions will be to initiate a chat with a BC rep using the link at the top of the page. Best of luck!
April 25, 2012
Where are the 6 ft west mountaineering...
Where are the 6 ft west mountaineering bags.every model I look at only has 5-6 and 6-6.
April 25, 2012
The bags are so popular that all of the normal sizes are out of stock right now. Check with a Backcountry rep in chat or by email or phone to see if they have an ETA on new orders.
March 18, 2012
I need to make one more check before...
I need to make one more check before investing in two of these Megalite bags. Assuming I get a Long LZ and a Reg RZ, can i couple/mate/zip two megalite bags together? Thanks.
March 18, 2012
They should zip together, the only thing to consider is one zipper may be slightly longer. But these are the best bags out there, and made in USA. You wont be disappointed.
March 19, 2012
April 13, 2014
I have this bag and a longer WM Kodiak, and although the temps of the bags are very different, they zip together without a problem! I've also noticed that a 6ft person can make due pretty well without feeling cramped in the 5'6" bag!
August 29, 2011
I wondering about this one or the Highlite....
I wondering about this one or the Highlite. I'm gonna use it as an ultarlite trekking bag for sleeping indoor or in a tent. For colder conditions I have an MH Phantom 15. Is there any reason to get this one over the Highlite?
August 29, 2011
With the Megalite, you can shift the down around to load up in cold spots and have a bit more circumference, it has a draft collar and full length draft tube, wider cut and a full-zip, but the Highlite is less expensive, narrower, lighter, different material, about the same stuff size, rated 5 degrees higher. Comparing specs side by side, both sound like they would suit you just fine. Nothing that Western Mountaineering makes will disappoint if you appreciate quality and know your needs. That said, my personal preference would be the Megalite, if for no other reason than the extra room.
August 29, 2011
Phil nailed the answer. Megalit is my call too!
June 5, 2012
Yeah...the collar and if you get caught out at 28f.
July 6, 2011
Hey guys i know the official packsize is...
Hey guys i know the official packsize is listed but is that compressed? or just stuffed? ALSO does the bag compress well i want a bag that goes down small =) Cheers!
July 6, 2011
The pack size listed is usually uncompressed. Down bags, especially WM, compress really well.
July 6, 2011
WM bags come with a regular stuff sac and so the compressed size listed is in a regular stuff sac. I've seen the Megalite compress to a little larger than the size of a softball before... Great stuff!
August 31, 2011
this bag comes with a large storage sack, it also comes with an XS 7 X 13 inch regular stuff sack. However, if you want it smaller than that, I recommend the sea to summit event compression dry sack. XS is 6X14 inch non compressed.
November 7, 2010
can i order this bag with 2 oz of...
can i order this bag with 2 oz of overfill?
November 8, 2010
Hey Rebecca, Backcountry cannot ship it that way. You can order the bag and once you receive it, send it in to Western for an overfill. I believe it runs about 60 bucks for that.
June 5, 2012
Then get it from the factory.
August 2, 2010
This question actually pertains to the WM...
This question actually pertains to the WM Summerlite, but the answer should be the same for the Megalite, thus I'm asking it here. I was told by a different dealer that a 6' RH zip and a 5'6" LH zip bags "cannot zip together". Does this mean that they physically cannot zip together, or just that there will be a little extra zipper on the longer bag?
April 13, 2014
There will just be a little extra zipper... I zip the mega into a WM Kodiak all the time! 1 is 5'6", the other is 6', and the temps are noticeably different depending on the side you end up on (only noticeable on a cold cold night though)... I have also noticed that a 6'2" person can sleep in the 5'6" Mega side without issues though, which is great if one person is warmer blooded than the other.
May 14, 2010
Hey, I'm looking at a 30 degree, lightweight...
Hey, I'm looking at a 30 degree, lightweight bag for summer, late spring and early fall in Idaho. I am having a lot of trouble deciding between the Marmot Hydrogen, MontBell U.L. Super Stretch Hugger #3 and the Western Mountaineering MegaLite. Anyone want to give their two cents to help me decide?
August 3, 2010
Here's my two cents: Both Marmot & MontBell make excellent bags. I've used both but when it came to putting my money on the line, Western Mountaineering won hands down for these two main reasons: 1. WM bags have the greatest warmth to weight ratio. In other words, their ten degree bag weighs the same as the competitions twenty degree bag. 2. All Western Mountaineering products are made in the USA from the most state-of-the-art materials available. I have owned two WM bags for many years & my answer is strictly a personal choice & preference.
October 21, 2009
I'm really intrigued by the continuous...
I'm really intrigued by the continuous baffle construction. Any testimonies to how well people like this? Does the down shift much in the middle of the night? I'm used to opening my bag up to use as a down comforter on warmer nights, and am debating if I want to go with a continuous baffle or divided bag from WM.
October 22, 2009
Get the continuous baffle! Its far warmer for little more weight. Basically there is a bit of mesh between each section rather than being sown though.
The Blue Bomber
November 2, 2009
I agree with Kurt. With a 4" loft bag like this, you don't have to worry much about down shifting (unless you sleep vertically like Batman). Go with the continuous baffle, the sewn through option creates cold spots where the bag is sewn, and is really only necessary when a bag has VERY little down in it (like the WM highlite). This bag has the perfect amount of down for its temp rating and I've never had any problems with down being in the wrong spot.
April 23, 2010
Continuous baffle construction is far superior than any sewn through option. Baffles aren't a negative, in fact he baffle gives the sleeper more options. Trust me, down will not move or shift during the night. I'm not even sure it would hinder batman all to much. You can make down shift if you want to, but it takes some significant effort. Sometimes I like to pack a little more on the sides so the top can breath a little bit better. If you just shake your bag a few times with the help of a friend, the down will settle back down evenly again and you're ready to go
October 12, 2012
I have one and love it. The advantage of the continuous baffle, is that you can shake the down to one side of the bag, Hint! move the down to the side that you are not going to compress with your body weight. Use a good quality pad (or two) and then you will have all of the down insulation where it will do the most good!