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The balance of weight, pack size and temperature rating make this a great choice for 3-4 season backpacking. It features 800+ fill power hydrophobic down, a full length zipper, lots of loft and an extremely effective hood design.
Marmot says:
Refuel on your next below-freezing backpacking adventure in the ultra-light Gas Bags, featuring a new sustainable ExpeDry water-repellant technology that increases performance and reduces the drying time of your down bag. With an optimal ISO-tested comfort well below freezing, the Helium -9° Sleeping Bag will keep you warm from head to toe in a super-packable 800-fill down bag designed to easily stuff into any overnight pack. A thru-hiking favorite, the new gas bags provide lightweight warmth that's light on the Earth--perfect when you're looking to maximize kilometers or speed in the mountains and minimize weight and space in your pack.
Our Verdict
Marmot's Helium Down Sleeping Bag uses 100% recycled material for the shell. It still offers a great balance of quality, weight, packability, and performance. It's comparable to many more expensive products, as it is lighter and more compressible than many of its competitors. It uses 800+ fill power down protected with Marmot's Down Defender to help the down to stay dry longer, loft better when damp and dry more quickly than untreated down. The new recycled Pertex Quantum fabric offers a combination of lightweight and good durability plus it's DWR coating will offer some water resistance. The fabric feels really soft which allows the down to loft freely and the slightly brushed feel of the Microlight lining fabric is extremely comfortable against your skin.
The -9°C Comfort Limit gives you some flexibility for pushing it into four seasons when paired with a good insulated mat. All the usual features are present with a bag of this quality plus the additional small 'fold-down' second zip which allows you to roll the top of the bag down. This is perfect for a warmer night to avoid overheating or for a cold evening where you want to be sitting in the bag inside the tent.
- Reviewed by Ultralight Outdoor Gear
Features
- Ultralight and packable certified 800+ fill power goose down with ExpeDRY water-repellant finish that increases performance and durability with reduced drying time.
- Anti-snag slider on main zipper and fold-down second zipper provide added ventilation and easy access in and out of sleeping bag
- Anatomically designed footbox with wrap-around construction increases warmth
- Smooth, curved baffles reduce down from shifting, increasing durability and reducing inconsistent heating inside bag
- ISO Tested for reliable temperature and comfort rating
- Stuff and storage sack included
- Stuff and storage sack included
Specifications
Temperature Ratings
- Recommended use temperature: -9°C
- Comfort: -3°C
- Comfort Limit: -9°C
- Extreme: -28°C
Short
- Weight: 905g (ex bag)
- Shoulder girth: 148cm
- Hip girth: 138cm
- Foot box size: 113cm
- Fits up to: 168cm
- Pack size: 36 x 18cm
- Insulation fill weight: 510g
Regular
- Weight: 965g (ex bag)
- Shoulder girth: 155cm
- Hip girth: 142cm
- Foot box size: 113cm
- Fits up to: 183cm
- Pack size: 36 x 18cm
- Insulation fill weight: 560g
Long
- Weight: 1059g (ex bag)
- Shoulder girth: 160cm
- Hip girth: 147cm
- Foot box size: 117cm
- Fits up to: 198cm
- Pack size: 36 x 18cm
- Insulation fill weight: 620g
Material & Construction
- Main Material: 100% Recycled Nylon. This item contains animal product.
- Lining Material: 100% Recycled Nylon Plain Weave
- Technology: Pertex® Shield, ExpeDry
- Sustainability: bluesign®-approved Material, Recycled Material, Responsible Down Standard
- Insulation: 800+ Fill Power RDS Goose Down ExpeDRY™
- Zipper location: Left zip
