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Weighing less than two pounds, the Rab Neutrino Endurance 400 Sleeping Bag is perfect for alpinists, mountaineers, and backpackers looking to shave weight. Rab's proprietary Hydrophobic treatment protects the 800-fill goose down insulation from moisture so it's not compromised by tent condensation or exposure to rain. Pertex Endurance covers the shell, inner hood, and draft collar with windproof and highly water-resistant protection while the Pertex Quantum lining resists abrasion and keeps the down as lofty as can be for a long time.

The Neutrino Endurance has a tapered mummy shape in order to cut back on weight and size for space-conscious adventurers. It features an adjustable hood, a draft collar, and comes with the zipper on either the left or right side for your convenience. Rab also included a dry bag compression sack as well as a cotton storage sack to keep the bag prime for many adventures.

  • 35°F European norm comfort rating
  • 800-fill goose down with Hydrophobic treatment
  • Tapered mummy shape
  • Pertex Endurance shell, and inner hood and collar
  • Pertex Quantum lining
  • Adjustable hood, draft collar
  • Left or right zippers available
  • 1 pound, fifteen ounces: ultralight
  • Dry bag compression and cotton storage sacks included
  • Reviews
  • Q & A

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Super Warm for the Temp Rating

  • Familiarity:I've put it through the wringer

I get cold very easily. Before I had this sleeping bag I had the Nemo Nocturnal 15 Deg bag, and before that a Big Alps (Synth). I opted for down because I needed something light for bpacking. I REALLY wanted the Montbell 800 #1 15 deg because although it is a mummy bag, the seams stretch to accomodate movement but that bag is $450+ so I got the Nemo (that one sucked) and then I got this RAB.

Rab is great. Granted I didn't get to try it out in 15 deg weather but the Rab was very warm when temperatures dropped to 20 deg F which was 5 degrees below its rating! Plus this is a guy's unisex bag so the insulation tends to be less compared to women's specific bag. Still I was able to stay warm. I am sure if you're a guy buying this bag, you'll definitely be warm. I am very impressed with this brand.

I slept like a baby during multiple spring backpacking trips. :)

Rab Hydrophobic Down

In the early days, Rab Carrington built his brand around down insulation, and we still see down manufacturing as a core part of the Rab brand today.

All of our down insulated products are filled with the highest quality Hydrophobic Down, developed in conjunction with Nikwax. The hydrophobic treatment is applied at source and is seen as the next step in our progression in down manufacturing.

Any plans to restock this in regular length?


We currently don't have any orders placed that I can reference, but I can find out when we will order this bag next. I will email you, as soon as I find out.

Feel free to call or email me, if you want to talk about other backpacking bags or gear, in the mean time.