15% Off One Full-Price Climb Item with Code: CLIMB15

Detail Images

  • Marmot - Back
  • Marmot - Helium Sleeping Bag: 15 Degree Down - Cobalt Blue/Blue Night
  • Marmot - Back -

Current Color

  • Marmot - Helium Sleeping Bag: 15 Degree Down - Cobalt Blue/Blue Night

Marmot Helium Sleeping Bag: 15 Degree Down

sale from $299.21 $418.9525% Off

Free 2-Day shipping on orders over $50*

Select a Size:

Select options
  • Select options
    • Reg/Left Zip
    • Long/Left Zip

    Select a Color:

    Select options
  • Select options
    • Cobalt Blue/Blue Night

    15 Reviews


    So light you'll forget you're asleep.

    Lighter than an imaginary cloud (and far warmer), Marmot's Helium 15-Degree Down Sleeping Bag is the perfect bag for long, chilly trips when added ounces can mean serious slowdowns. The Helium is part of Marmot's Ultralight series, which isn't quite as airy as the barely-there Ion, but it's a lot more affordable and still a killer three-season bag for backpacking, camping, and alpine missions. Pertex Microlight and nylon ripstop fabrics keep the superlight 800-fill goose down from escaping, and Marmot's Smooth-Curved baffle construction prevents the insulation from shifting around, so you're not fighting cold spots as you drift off to sleep. The Helium also sports an anatomically designed footbox and drawcord hood to keep your extremities toasty, and it uses a dual-zipper construction to let you fold down the top of the bag to sit up and increase ventilation when the night is a little warmer than expected.

    • 15 degree temperature rating
    • 800-fill down insulation
    • Pertex Microlight and nylon ripstop fabrics
    • DWR treatment
    • Anatomically designed wrap-around footbox
    • Drawcord hood
    • Dual zippers
    • Item #MAR00TJ

    Tech Specs

    [face fabric] Pertex Microlight (20D nylon ripstop), DWR treatment, [lining] 30D nylon, DWR treatment
    800-fill down
    full-length left, short right
    Bag Length
    [regular] 6 ft, [long] 6 ft 6 in
    15 F
    Claimed Weight
    [regular] 2 lb 1 oz, [long] 2 lb 4.5 oz
    Recommended Use
    camping, backpacking
    Manufacturer Warranty

    Tech Specs

    • Reviews
    • Q & A

    What do you think about this product?

    Have questions about this product?

    Warm, soft, and quiet

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

    Technically, this bag is amazing. I'm 6'5" tall and fit in the Long with room to spare for extra socks and the morning's clothes at my feet. The good cinched down perfectly so my mouth and nose were left exposed, so condensation from breathing didn't foul the bag. The nice long zip made temp control a simple task, as my first multi day use was in Iceland with temps ranging from 35-65 F. It is water resistant, and even when the shell is waterlogged, the down didn't compress too badly.

    It packs down to the size of a large grapefruit, I used a small S2S eVent compression sack. As far as weight, it was barely noticeable as I was not pushing for ultralight - at just over 2 pounds, it easily fits into a very light pack.

    All in all, it's a terrific bag and I will update my review after winter when I can push it past its ratings.

    The Ideal Bag

    • Familiarity: I've put it through the wringer

    This is my favorite sleeping bag ever-- it kept me very comfortably warm during an unexpected freezing snow storm in the Wind River range with only a tarp over my head and this bag around my body. Yet it is also so light that I barely even notice it on long hikes and steep technical climbs. It comes with a large storage bag to keep it loose for storage and a separate small bag for compressing it and taking it on hikes/climbs. The sleeping bag compresses so well that with almost no effort I can stuff it in the tiny sack and quickly be on my way. I can't imagine any better sleeping bag and highly recommend it for any sort of alpine trip (you would probably only want a warmer temp rating if you were doing winter alpine activities or obviously if you were in alaska or himalayas or something, but for most 3-season high-altitude alpine activities in the U.S. this bag with an insulative pad and your layers should be sufficient), I only wish it were also available with left/right zipper options. I am 6ft tall and the regular works great with a little room for stuffing a few clothes at the bottom if necessary.

    Marmot Helium Sleeping Bag

    • Familiarity: I've used it several times

    Love this bag. High quality and compressible down and very light weight. Kept my wife warm this summer in Utah and Colorado. She gets cold very easily and this was what she needed when the temperatures dropped to the 40s. Great investment. Marmot always makes great gear and committed to excellence.
    Thanks Kyle Livingston at Backcountry for helping us out.

    The Perfect Three Season Sleeping Bag

    • Familiarity: I've put it through the wringer

    This bag is so freaking versatile its unrealI! I slept comfortable at 10,000 ft when it got down to 25F degrees, but I've also used it in the desert where the low was 75F! I Its also insane how light this bag is. I have the long and it weighs in at just over 2 lbs, and it practically packs down to nothing. It really is the perfect 3 season sleeping bag. Feel free to contact me if you have any questions!

    Lighter than champagne

    • Familiarity: I've used it several times

    I wanted an 800 down, high-quality, three-season sleeping bag to work primarily in high-elevation camping. Early in the spring season, I slept comfortably in the desert around Moab at 5,000 feet. Later, with snow still on the slopes, I slept well at 10,000 feet near Pikes Peak. The sleeping bag is ideal for dispersed camping in wilderness areas throughout the Mountain West, paired with an 800 down jacket or fleece. The bag is compressible, of course; the materials are high-quality, apparently durable; zipper is snag-free. The bag is so light, I feel like I am sleeping naked. I feel this was an ideal purchase. This will usually replace my heavier Marmot Never Summer bag, the bed that has fulfilled my nine-month, high-mountain needs for two decades. Great, versatile, lightweight, reasonably-priced 800 down sleeping bag.

    Awesome bag

    • Familiarity: I've put it through the wringer

    I've taken this bag everywhere in every season over the past year and wouldn't buy any other. It is super light and compact for the amount of warmth it provides. It is actually too small to base my backpacking bag when in the given compression sack, so I put mine in a 20L drypack with my puffy and clothes for a wider base. I've heard the 15 degree rating is a little generous, but I sleep hot and wouldn't know. I've spent many nights cozy in this bag and a quinzee.

    Rockin Bag

      I love Marmot Bags. They have never given me problems with leakage, they compress down awesome and are pretty light. Just as a warning, I think the 15 degree rating is more of an extreme rating, so if you run a little cold, you may want to look somewhere else.

      Amazing, Incredible, Superb Sleeping Bag

      • Familiarity: I've put it through the wringer

      I carried this sleeping bag with me the whole way from Mexico to Canada on the PCT this past summer (2016). This was hands down my most favorite piece of gear. I looked forward to crawling into it every night and I did everything and anything I could from within it each morning just to delay getting out of it. It kept me warm in all the rain, snow, hail, and intense wind that I encountered through the desert, Sierras, and Washington with just a Therm-A-Rest Ridgerest underneath and no liner. I didn't carry a thermometer so I'm not sure what temperatures it got to, but it was certainly below freezing on multiple occasions (woke up to frozen shoe laces) and I never awoke due to being cold. In fact, most nights I would have to unzip the bottom half because I was so warm!! I literally cannot think of a single con to this bag even after 4.5 months -- it is still just as lofty as the day I received it, it's spacious inside if you like to move around a lot in your sleep (I do) but never lets in cold air, it only shed a few feathers hear and there, packs down small in my 65 L pack...just an all around perfect bag.

      For reference: I'm female, 5'6", around 140 lbs, and I bought a regular size. I had probably 6-8 inches of extra room at the bottom and plenty of room around me.

      Great bag for the cold

      • Familiarity: I've used it several times

      Used this bag for 4 nights in Yosemite over Thanksgiving. 2 nights were around 30F and the other 2 were 10-15F camping on snow. It packed down super small to make space in my backpack for the warm gear needed to get through the day. The foot box had plenty of room and kept my feet warm which is something I've had a lot of trouble with in other bags. I'm 6'3" and fit fully stretched out and it's comfortably roomy in a normal sleeping position without letting the warm air out. Great bag that was definitely worth the money.

      Nice but not a 15 degree bag

      • Familiarity: I've put it through the wringer

      I really want to like this bag but do not feel it is a 15 degree bag. It is just not that warm.

      I own the Marmot 30 degree 800fill Arroyo as well as the 800 fill zero degree bag. Both are true ratings. I wanted a fall bag where the 30 was not enough but the 0 was too much.

      After several weeks of use in Wyoming and Montana where nightly lows occasionally hit 28 and usually about 35 I slept cold most nights. I added a liner and slept in my base layers and still never got as warm as I expected. For comparison I have many Wyoming nights in my 30 degree Arroyo where it hit freezing and only when it hit 27 did I start to get cold. With my zero degree bag, I cannot even zip it up until it's colder than 20.

      I was really hoping this would split the difference, but it does not sleep any warmer than my old Arroyo.

      Thanks for detailing the relative warmth of the 30 degree bag and the 0 degree bag. That was useful. Am looking to replace my MTN Hardware 32 Phantom bag. It's 800 fill, but feels cold at 32. I have to wear my down sweater when it gets that low, or I'll be cold.

      Best bag ever!

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

      My husband, 10 year old son, and I got into backpacking 5 years ago. We finally decided to get our pack weight down to a more manageable level. We discovered that our old sleeping bags were near 4-4 1/2 lbs. We were suffering so on the long hikes. We researched bags and lo and behold we found the Marmot Xenon for women and the Helium for men. Mine 2.5 lbs, his 2.1. We went to Yosemite over Labor Day. The nights were quite chilly. Low 40's. The new bags were super warm. Only needed underwear and a base layer inside. Cozy cozy. Not only did we have lighter packs on our trip but toasty warm nights! We both bought the regular length. I am 5'6" and my husband 5'9" with slight builds. We fit perfect in each. Well worth the expense! Thank you Marmot!

      light and lofty

        so happy with this bag! packs down small, then fills out very nice when open. hooded area works great as a pillow if you stuff some xtra layers underneath it. excellent customer service from backcountry.com throughout my ordering process.


        • Familiarity: I've used it several times

        I have used this from 17-35 degrees without a pad and it is amazing! I'm always warm, and comfortable. The down quality is great. It regains its loft quickly after being in the stuff sack. It is super light and I love the venting, and cinching capability to increase or decrease warmth.

        One for the long haul

        • Familiarity: I've put it through the wringer

        This is my second Marmot Helium bag. the first served me for almost 20 years...in fact, I still use it in the summer. It has lost some loft and warmth from a couple goes through the washing machine.

        The new one I have had for a couple seasons and it's just a great spot to be when it gets chilly. I've used it down to about 20 degrees on a October trip to the Sierra. Super compressible and light, but still plenty roomy so I can pull my knees up (i'm 6' even and sleep on my side). I am very careful with this bag: it doesn't stay stuffed any longer than necessary.

        Looking forward to many years of service from this bag.

        Unanswered Question

        How small does this bag pack? Also, what size of compression sack would be optimal? Thanks

        Does this version of the Helium 15 have the water resistant down? (Down Defender)? Thanks!

        Hey Jonathan - The 800-fill goose down in the Helium 15 is treated with Marmot's Down Defender and the Pertex outer material has a DWR treatment to make this bag even more water resistant. Feel free to contact me directly with any additional questions.

        - Kyle L. - Expert Gearhead