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The Marmot Plasma 15 Sleeping Bag is rated down to 15F, even though it weighs as little and packs down as small as your summer bag. Thanks to its lofty, highly compressible, ultra-premium 900-fill down insulation and Pertex Quantum shell fabric, you’ll stay toasty on shoulder-season and winter outings.

  • EN comfort-rated at 29-degrees F for shoulder-season backpacking in the mountains; lower-limit-rated at 18-degrees F for occasional use during yurt trips or overnight spring tours in the mountains
  • Ultra-premium 900-fill goose down is as light as a wisp of fog and as good at rebounding as a seven-foot-tall center, and it features one of the highest warmth-to-weight ratios known to humankind
  • Durable, DWR-coated Pertex Quantum shell fabric keeps weight to a minimum while maximizing packability, shedding a little exterior moisture, and enhancing breathability so that condensation doesn't build up in the down insulation
  • Down-filled draft collar, down pillow, full-length zipper with draft tube, and drawcord adjustable down hood lock in your warm and seal out the fall cold front
  • Insotect Flow vertical baffle system reduces weight and efficiently transfers heat from the core of your body to your extremities
  • Vertical baffles optimize thermal performance and significantly reduce weight while Flowgates strategically placed along the baffles secure the down and trap more heat in the core and footbox
  • Wraparound foot box vaults the foot area so as to prevent the compression of down and extend the bag's comfort range
  • Entire bag weighs less than two pounds (regular) for ultimate backpacking and trekking performance
  • Zipper garage and smooth area around the face reduce chafing and discomfort when you're tucked into the bag during cold nights
  • Two loops at the foot allow you to easily hang the bag to air it out
  • Included stuff sack lets you pack the bag down to an incredible 7.5 x 7.5inch packs (both regular and large) so you can easily find space for it in your pack
  • Included storage sack provides a safe place to store the bag at home and keep its loft over many years of use
  • Winner of numerous industry awards, including Outside Magazine's 2011 Gear of the Year, Backpacker Magazine's 2011 Editors' Choice, and National Geographic Adventure 2011 Gear of the Year

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Marmot Plasma 15 Sleeping Bag:15 Degree Down

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Here's what others have to say...

5 5

My new best friend!

  • Familiarity: I've used it several times

This is like sleeping in a cloud! I have taken this bag from 25 degrees in a yurt to 60 degrees and have been comfortably warm. The shape gives me plenty of room to get comfortable with no cold spots. It packs small and is extremely light. Right out of the shipping package, it was like WOW can't wait to go camping with this. I have been recommending this bag to all my outdoor friends.

5 5

Love This Bag!

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

Let me start by saying I hate the cold, really really hate, so when I purchased this bag I bought it for warmth and comfort in mind. It has exceeded my expectation in both comfort and weight.

5 5

Holy Crap

  • Familiarity: I've used it several times

This thing is awesome!

I have owned several synthetic bags and they served a great purpose in helping me figure out what I needed in a good backpacking bag......that is where it ends though.

This marmot bag is insane! it is light, warm as hell (slept in it at 10,000 in the rae lakes loop of kings canyon in rough weather), and it packs down to almost nothing.

I am 6'0", 165 and tend to sleep a touch warm. Used this guy on a standard foam sleeping pad and was stoked. bought the 6' bag and am perfectly comfortable.

I recognize the price tag, but this thing is worth it and you will be happy every time you slip into it for a toasty night. Wishing nights were colder in southern California just so I could sleep in it on top of my bed!

Hoping this bag lasts 10 years with the right care.

5 5

Awesome Sleeping Bag!

  • Familiarity: I've put it through the wringer

First - do yourself a favor and get a nice air mattress to go along with your sleeping bags, particularly if it's this one (or something just as expensive)!

I purchased this bag because it uses super-high 900 fill power down, making the it very compressible and light. In fact, I am now using my 50L bag for multi-day trips (I also purchased an UL tent, which helped!). I also get cold feet and I was interested at the claims of the Marmot folks that the continuous baffling in the foot box would make my feet warmer.

The zipper goes always all the way down to the bottom of the footbox, which is a nice touch. The down "pillow" is a bit of a joke. If Marmot wanted any sort of "pillow" experience they should have used much less higher power down for the pillow portion, which would have made the pillow less compressible. Unfortunately, the pillow is also 900 fill power down, which basically means it goes flat as soon as you put your head on it. Another solution would have been to make the pillow area a zippable compartment so you could stuff the it with whatever you chose.

I'd say this is the perfect bag for spring, summer, and fall use; possibly winter, if you layer up and it's not -40F with windchill. I use a cheaper synthetic bag when I'm expecting high humidity and/or wet weather.

5 5


  • Familiarity: I've put it through the wringer

Love this bag. I bought it about a year ago and I've been a satisfied customer!

I was looking for a bag that packed small but kept me warm in colder climates. Something I could use from the spring thru the fall without getting overheated or cold. My first outing with this bag was up in the Wind River range last October with temperatures dipping into the high 20's and a forcast for light snow. I was colder during the day than I was sleeping at night!

Since then I've used the bag in the Uintas as well as around Zion National Park with temperatures ranging from the 40's up into the 50's at night and slept like a baby. The only times it became a little warm, I just pulled my arms out of the top and unzipped it a little and slept fine.

Because of the vertical baffles, it stuffs down super small especially for a 15 degree bag. I have noticed a little leakage after just a couple of uses but it's nothing to cry over.

Responded on

The pillow in this bag is not meant to support your neck. Rather it is a design feature that is meant to prevent a cold-spot on the back of your head. If it is doing that, then it is doing its job!

5 5

Love this Bag!

The title of my review pretty much says it all. Used it on ski mountaineering trip on Mt. Shasta last summer, and stayed roasty toasty when the temps dipped into the low 20's at 10,400-ft. Literally slept with boxers and a pair of hiking socks (my toes get cold easily). I did notice some minor issues with the zipper, but as long as you're reasonably careful its not really a problem. Love the light weight and packability, and can't wait to use it in the Sierra this Spring/Summer! Luckily I had gift cards to help offset some of the cost, but its worth paying full price in my opinion.

Unanswered Question

Anyone know how the DWR-coated Pertex shell...

Anyone know how the DWR-coated Pertex shell on the Plasma compares to the Membrain 2L fabric on the Marmot Helium MemBrain? Is it as waterproof as the Helium MemBrain?

5 5

Seriously light

this bag packs amazingly small and light.
I'm a big guy 6'3" 250 Lbs
This bag was a little tight for me.
Usable but tight, what it lacks in spaciousness it more then makes up for in quality. I'm very impressed.
The construction is top notch.
I've had it into the low 20's and been toasty.
In my opinion, Marmot makes the best non custom bags.
This is one of Marmots best bags.

5 5

Amazing performance

On a trip up to the north cascades recently it got down to 12deg at high camp that night. With two thermal layers on and toe warmers wedged between my liner and my wool sock I was toasty warm and slept like a rock. The rest of my rope team was not so lucky. Most of them ended up wearing every stitch of clothing they had to stay warm. At around 330am I added some glove liners and my buff over my nose, but would've been fine without as well.

As others have stated, the zipper does get stuck. You have to be pretty patient when you want to zip up, and take the time to put on your headlamp real quick and do it right otherwise you could shear the bag. I found this particularly inconvenient when I was groggy and half awake after a bio break and had to fully wake up to get the zipper closed up again. It was certainly an inconvenience but not worth dinging the bag a full star. I'll take warmth and a good nights sleep at 8k feet with a picky zipper versus struggling to stay warm wishing the sun would come up all night. Don't pretend you don't know what I'm talking about.

4 5

Marmot Plasma 15 Degree Rocks!

  • Gender: Male
  • Familiarity: I've put it through the wringer

This is my second Marmot bag (my first being the Never Winter model). I've used the Plasma 15 for mid-September alpine backpacking trips (think, low 20's) for the last two years. On the coldest nights, this baby has kept me toasty warm. The bag is super-light (my size regular is 1lb, 14.8 oz and the matching stuff sack is 0.9 oz) , it packs small (my stuff sack is 7" diameter x 13" long) and it fluffs up quickly (to 6-7" thick). The bag's shoulder, hip and foot circumferences, like the Never Winter, are generous - allowing me to move around as needed (unlike the constricting shape of some other bags).

My only gripe (and a one star deduction): using the zipper is like going to Snag City. The Marmot web page for this bag USED TO HAVE the following bullet point in the bag's"Technology" section: "Zipper Guard: keeps the draft tube fabric from getting caught in the zipper". I noticed this statement is no longer on the we page (hmmm....). The zipper problem isn't a deal breaker for me, only an inconvenience. I still think this bag rocks!

Marmot Plasma 15 Degree Rocks!
5 5

Another Marmot Winner

This is my third Marmot bag; I also own the Never Summer 0 degree and the Pounder 40 degree. For the price, the Never Summer is a great bag, but a little on the chunky side (4 lbs!) My Pounder is great, but it weighs over a pound (1.4 lbs I think), but don't worry Marmot, I am not suing for false advertising! But the Plasma...what can I say? It's super warm and feels warmer than the 15 degree rating. I am 6-1, 200 and bought the long. I admit I sleep warm anyway, but it's a heater. Took the bag into near 0 temps and I was just fine in it. The Plasma is really packable, which is fantastic when you are trying to cut weight and keep the smallest pack size possible during Alpine style climbing. In South America, the bag got a little on the wet side with a lot of condensation. The pertex DWR kept the insides dry and the bag itself dried pretty quick when others in my team weren't so lucky. Bag has never failed to loft up, vents pretty well and is more durable than you would first think in feeling the exterior material. I got mine on sale and feel lucky...but, and I don't say this often, this bag is worth full price and then some. Yes, the zipper sticks, but you will find that in light weight bags with thin materials. Just watch it a little and back it off when it sticks. No big deal really and I am just getting nit picky. Bags cut is on the trimmer side, but is acceptable. Perhaps that is one of the reasons it stays so warm (in addition to the draft collar). This bag will be in my pack for years to come due to it being bomber and high quality. Thanks Marmot!!

Responded on

Arnold included important information a newbe like myself found very helpful.

Responded on

Hey thanks pal, I appreciate. I try to pack in as much info as possible in all my reviews. Like most here, I really depend on reviews before plopping down whatever dough I have.

5 5

Love love love

Love this bag! It's super lightweight, incredible comfortable, yet I haven't had an issue getting too hot, even in Moab, Utah. Just open the flap or worse case use it as an incredible blanket.

The ONE tiny little thing that I do agree as a con for this bag is that it's pretty easy to get the zipper snagged. Gotta be a little careful when unzipping it, but other than that, this is the best backpacker sleeping bag money can buy.


5 5

A+ Sleeping Bag

I slept in this bag in Vedauwoo last weekend for the first time. We got to camp and it was blowing 25+ with gusts up to 65 mph and it was snowing. Not nice weather. Not sure how cold it got to overnight, but the beer froze so it was pretty chilly. The Plasma 15 kept me warm and I slept through the night no problem. Much more comfortable than most lightweight bags and I could feel the warmth in the footbox and hood. Definitely the best bag I've owned and worth the $.

5 5


I backpack in the Rockies and am usually sleeping at 8000-10000 ft, so nights get pretty cold even in July and August. I've also found that most bags really don't perform down to their temperature rating (especially over time); I have spent many cold nights in my North Face Kilo. I wanted to upgrade without increasing pack weight. This bag, while pricey, has met all of my expectations. Warm nights at last!

FYI, I'm 6'3 and 200 with wide shoulders and the bag (long version) does not feel overly tight - it seems (from customer reviews) that some bags in this weight class (e.g., WM Ultralight 20) are overly restrictive. Looking at the shoulder/hip/foot circumference specs seems to indicate that this bag is in fact more roomy than others.

What is this bag being replaced with?

What is this bag being replaced with?

Responded on

It's not being replaced, just sold out right now.

5 5

Plasma Transfusiin

This is the best sleeping bag I slept in last night.