Which is warmer, the Rab Neutrino 400 or the Marmot Hydrogen 30?

The Rab Neutrino 400. It is rated to -7C with 400g of down plus a hood and neck baffle. The Hydrogen 30 is a 30F summer bag.

Is the Marmot Hydrogen 30 light enough for fast packing?

Yes. It is one of the lighter 800-fill bags around and packs small. The Rab weighs more but carries more warmth.

Do I need a hood on a sleeping bag?

For nights near or below freezing, yes. The Rab's hood and neck baffle trap heat. The Hydrogen has no hood, which is fine for mild trips.

Both last years with care. The Rab's recycled ripstop shell and box baffles resist wear and down shift well. Store either bag uncompressed to keep loft.

Is the Rab worth stepping up to from the Hydrogen?

If you camp in cold or exposed conditions, yes. The extra warmth and hood matter more than the added weight. For summer only, the Hydrogen is enough.

Rab Neutrino 400 Sleeping Bag vs Marmot Hydrogen 30 Sleeping Bag

The Rab Neutrino 400 is the warmer, more technical bag: 800-fill RDS goose down, a hood, an insulated neck baffle and a tapered cut built for cold mountain nights. The Marmot Hydrogen 30 is the lighter, simpler option for mild-weather trips where pack weight matters most. Reviewers praise Rab's loft and baffle construction; owners of the Hydrogen like its low weight but note the sparse features and thin shell.

Choose the Rab Neutrino 400 if you sleep cold, camp above the treeline or want a hood and neck baffle for three-season alpine use.
Choose the Marmot Hydrogen 30 if you mostly camp in summer and mild shoulder seasons and want the lightest bag you can carry.

Prices

Rab Neutrino 400 Sleeping Bag: $304.99 at evo.com (checked today)
Marmot Hydrogen 30 Sleeping Bag: $364.65 at CampSaver.com (checked today)
Difference: the Rab Neutrino 400 Sleeping Bag is $59.66 cheaper than the Marmot Hydrogen 30 Sleeping Bag today

	Rab Neutrino 400 Sleeping Bag	Marmot Hydrogen 30 Sleeping Bag
Warmth rating	Rated to -7C with 400g of down	Rated to 30F, a lighter summer bag
Hood	Insulated hood with adjustable neck baffle	No hood; mummy cut only
Weight	About 895 g in Long Wide	Around 1 lb class, noticeably lighter
Shell fabric	Recycled Pertex Quantum ripstop with fluorocarbon-free DWR	Water-resistant nylon shell
Baffle design	Trapezoid box and chevron baffles limit down shift	Standard mummy baffling
Pack size	Ships with a waterproof roll-top compression sack	Comes with a stuff sack
Fit	Highly tapered, close-fitting; offered in Long and Wide	Standard mummy, unisex
Best season	Cold three-season and alpine	Summer and mild shoulder season

Spec	Rab Neutrino 400 Sleeping Bag	Marmot Hydrogen 30 Sleeping Bag
Temperature Rating	-7C	30° F
Fill Power	800FP	800 fill power
Shape	Highly tapered design	Mummy
Color	Nightfall Blue	—
Care Instructions	Store it away uncompressed to help keep its loft	—
Closure Type	Zip (left)	—
Pattern Type	ripstop	—
Size	Long, Regular, Wide	—
Count	1	—
Item Weight	895 g / 31.6 oz (Long Wide)	—
Fill Type	Down, Goose down	—
Material Type	Recycled Pertex Quantum outer	—

Spec	Rab Neutrino 400 Sleeping Bag	Marmot Hydrogen 30 Sleeping Bag
Material Certifications	Nikwax fluorocarbon-free hydrophobic finish	—
Age Group	Adult	—
Occasion	Mountain missions, Mountaineering	—
Typical Users	Outdoor Enthusiasts	—
Fit Style	Close fitting (adjustable neck baffle design)	—
Organic	No	—
Design Highlights	Hood, Adjustable neck baffle, Stuff sack	—
Length	230 cm (Long), 90.6 in (Long)	—
Width	9 in (packed size)	—

Rab Neutrino 400 Sleeping Bag vs Marmot Hydrogen 30 Sleeping Bag

Prices

Rab Neutrino 400 Sleeping Bag vs Marmot Hydrogen 30 Sleeping Bag

Prices

Marmot Hydrogen 30 Sleeping Bag

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