Marmot Helium MemBrain

2 reviews
5-star:   2
4-star:   0
3-star:   0
2-star:   0
1-star:   0


Regular Long
Weight 2 lb 5 oz / 1050 g 2 lb 9 oz / 1162 g
Fill Weight 1 lb 3.5 oz / 552 g 1 lb 5.5 oz / 609 g
Temperature Rating 15 F / -9.4 C 15 F / -9.4 C
EN Comfort 22.5 F / -3.6 C 22.5 F / -3.6 C
EN Lower Limit 13.8 F / -10.1 C 13.8 F / -10.1 C
EN Extreme -19.8 F / -28.8 C -19.8 F / -28.8 C
Fill 850 Fill-Power Down 850 Fill-Power Down
Shape Mummy Mummy
Max User Height 6 ft 0 in / 180 cm 6 ft 6 in / 200 cm
Hip Girth 58 in / 147 cm 58 in / 147 cm
Foot Girth 40 in / 101 cm 40 in / 101 cm
Price $459.00 USD $479.00 USD



This thing is like a dream. Waterproof outside, breathable…

Rating: rated 5 of 5 stars
Price Paid: $367

This thing is like a dream. Waterproof outside, breathable and comfortable inside. The MemBrain lining, although I'm not sure if it's worth the extra money, feels amazing.  

After camping while smelly and sweaty, this bag seems to remain clean, which means you'll have to wash it less and it'll last longer than other bags. The down is very lofty and lightweight, like sleeping in a warm cloud, and packs down very small.  

Quality seams and no leakage; I was worried at first as I saw some down on the bag when it arrived but it must have been from the factory since I haven't seen any since.

I'm 6'0" average build and got the long version and it fits great. I find that even though most regular bags supposedly fit 6ft people, the hood won't cover your head enough.  Found at with a 20% off coupon for $367 ($430 normally at many of the cheapest places).


Great lightweight 3-season backpacking bag. Have been…

Rating: rated 5 of 5 stars
Source: bought it new
Price Paid: around $350 on sale


Great lightweight 3-season backpacking bag.


  • warm
  • roomy
  • lightweight


  • none

Have been down in the mid twenties with no extra clothes on, very warm, very roomy mummy shape. I'm 5'9" 200 lbs with plenty of room, packs down small. At a shade over 2 lbs great bag for backpacking.

Have had the bag for about 4 yrs with no problems at all. Thanks.

Manufacturer's Description

Sleep well—absolutely anywhere. Fiery 850+ goose down meets the weather-fighting power of Marmot’s waterproof and breathable MemBrain fabric to create a fantastic sleeping system for lightweight, alpine travel in unstable climates. Marmot's big-mountain heritage is on display head-to-toe, from the six-baffle hood to the trapezoidal foot box.

Visit Marmot's Helium MemBrain page.

Retailers' Descriptions

Here's what other sites are saying:

CLOSEOUTS . Designed for alpine enthusiasts who enjoy nights in cold climates, Marmotand#39;s Helium MemBrainand#174; sleeping bag is packed with 850 fill power goose down that has an excellent warmth-to-weight ratio. Available Colors: PACIFICA.

- Sierra Trading Post

Key Features of the Marmot Helium MemBrain 15F 850 Down Sleeping Bag - Long Size - Left ZipperEN TestedPassive CollarHood Draw CordInsulated Draft TubeStuff and Storage Sack IncludedZipper GuardsMarmot Helium MemBrain 15F 850 Down Sleeping Bag - Long Size - Left ZipperThe Marmot Helium MemBrain 15F 850 Down Sleeping Bag - Long Size - Left Zipper lets you sleep absolutely great, anywhere. Designed with Marmot MemBrain, Waterproof/Breathable Fabric for excellent weather resistance, and comfort, this bag has a classic trapezoidal foot box to allow you more foot room. The Nautilus 6-Baffle Hood has chambers of down around the head for a better fit, and the hood cord has been placed, in such a way, that it is very easy to access.� The Velcro-free face muff makes sure the drawcord, and zipper, stay away from your face. Stretch Tricot� baffles are provided to increase strength, durabilty, and make sure your� bag has a long lifetime of service. The Marmot Helium MemBrain 15F 850 Down Sleeping Bag - Long Size - Left Zipper, will keep you warm and toasty, during cold nights in the outdoors.

- SunnySports

Marmot Helium MemBrain


The Marmot Helium MemBrain is not available from the stores we monitor. It was last seen February 9, 2014 at Sierra Trading Post.

If you're looking for a new 3-season down sleeping bag, check out the best reviewed current models.