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Neutrino 400 Sleeping Bag: 20F Down

5 out of 5 stars
5 Reviews
Current price: $326.25 - $356.25 Original price: $475.00
25% off

Style & Size:


Why We Like The Neutrino 400 Sleeping Bag

Mountaineers and trekkers alike revel in comfort when the Neutrino 400 Sleeping Bag is our blanket for the night. Rab designed it with a high-loft down that delivers a whopping wall of heat when the chill tries to bite its way in. And to prevent any cold penetration, the Neutrino is built with chevron-shaped and trapezoid box-wall baffle construction. Plus, a tapered mummy design and angled footbox design let us slip into a more natural position, ensuring we're comfortable at all hours of the night.


  • Low-bulk sleeping bag for soft and lofty warmth in the mountains
  • 400 grams of 800-fill down for blazing heat on chilly hike nights
  • Pertex Quantum fabric ensures a lightweight and a high durability
  • Chevron shaped and trapezoid box-wall baffles eliminate cold spots
  • Close-fitting neck baffle is adjustable to maximize heat retention
  • Angled footbox gives a more natural and relaxed sleeping position
  • Zippered internal stash pocket safely secures your phone at night
  • Includes waterproof roll-top storage sack for protected organization
  • Item #RABZ0HM
Responsible Collection
Pertex Quantum (100% recycled nylon), Nikwax finish
800-fill down
tapered mummy
Max User Height
[regular] 74.8in, [regular wide] 66.9in, [long, long wide] 78.8in
Shoulder Circumference
[regular] 27.5in, [regular wide, long] 26.8in, [long wide] 28.3in
Hip Circumference
[regular] 20.5in, [regular wide, long] 21.3in, [long wide] 22in
Foot Circumference
[regular, regular wide] 16in, [long, long wide] 16.5in
Bag Length
[regular] 86.5in, [regular wide] 78.8in, [long] 90.5in, [long wide] 90.5in
Draft Tube
1 internal zippered stash
Pad Retainer
Fill Weight
European Norm/ISO Lower Limit Rating
Stuff Sack
waterproof roll-top
Stuff Size
13.8 x 9.1in
Claimed Weight
[regular] 1lb 11oz, [regular wide] 1lb 12oz, [long] 1lb 13oz, [long wide] 1lb 16oz
backpacking, weekend camping
Manufacturer Warranty

Overall Rating

5 based on 5 ratings

Review Summary

1 Stars - 0 reviews
2 Stars - 0 reviews
3 Stars - 0 reviews
4 Stars - 0 reviews
5 Stars - 5 reviews

What do you think about this product?


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5 out of 5 stars

February 26, 2024

Tested my new sleeping bag

Tested my new sleeping bag over this past weekend in a Yorkshire bothy. Temperature dropped to -3 overnight, combined with a Stratosphere 5.5 mat, cotton liner and thermal underwear - I was comfy all night.

Brad I.

Originally reviewed on Rab

5 out of 5 stars

September 25, 2023

When you look forward to going to bed

There is nothing more snuggly than wriggling into a sleeping bag which warms up quickly when the weather is cold and grim outside - this sleeping bag does it all. I simply LOVE LOVE LOVE it. I went for the women's fit so it's not too long (I'm 160cm tall). It packs up really small (been used for mountain marathons) but retains all of it's loft even after being packed down for a few days, I love the fact the zip has an anti catch zip on it and the bottom zip opens independently should your feet need cooling down.

Theresa J.

Originally reviewed on Rab

5 out of 5 stars

July 11, 2022

It’s light, it’s warm, the

It’s light, it’s warm, the pertex shell feels robust and damp repellent. Packs down into the bike bag brilliantly and the long size is a dream.

Stephen S.

Originally reviewed on Rab

5 out of 5 stars

June 19, 2022

Weight to warmth ratio is

Weight to warmth ratio is amazing. Lofts really well out of the niffty dry bag it comes with. Also included is a nice storage bag. A very high quality product that should over 20 years of service. My last RAB bag has.

richard h.

Originally reviewed on Rab

5 out of 5 stars

June 8, 2022

Bag arrived promptly, beautiful. Got

Bag arrived promptly, beautiful. Got my first Rab bag in 1995 for a Denali trip. It's still great but too hot and heavy for the more mundane UK work these days. This has been perfect so far for the couple of nights out I have used it the weight for warmth is first class. Thank you.

Nigel W.

Originally reviewed on Rab