Rab Neutrino 400 Down Sleeping Bag

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UOG TOP PICK—Rab’s Neutrino range features 800 Fill Power down intelligently baffled and a Tapered Mummy shape for an excellent warmth-to-weight ratio. It is a fantastic all-round bag for trekking or fast and light, and it is one of our top picks.

Rab says:

Eliminating excess bulk with a highly tapered design and offering exceptional warmth and protection for its weight, this bag is built for fast and light mountain missions. Filled with 800FP, goose down and covered with wind and water resistant, recycled Pertex® Quantum Outer.

For the alpinist looking for a lightweight, low bulk bag suitable for cold temperatures, the Neutrino 400 offers exceptional packability and warmth for its weight. Designed with a narrow mummy fit, for reduced bulk and pack size, and constructed with lightweight, high performance materials. It’s perfect for three season mountain missions.

The Neutrino 400 is filled with 400g of 800FP, goose down, stabilised in chevron shaped baffles, cleverly designed to reduce the amount of fabric needed compared to traditional horizontal baffles. The trapezoid boxwall baffle construction allows the down to fully loft, eliminates cold spots, and maximises warmth. Additional baffles along the length of the zip and around the neck decrease heat loss, and with an adjustable drawcord around the hood you can cinch the bag around your face.

Now built with a recycled nylon lining and recycled Pertex® Quantum outer, it’s wind resistant and a little lighter on the planet too. The down is also finished with a Nikwax, fluorocarbon-free hydrophobic treatment for coping with condensation. It has a ¾ length zip with anti-snag zip guards, a zipped internal stash pocket and comes with a waterproof roll-top compression sack for easy stashing.

Hand-filled in the UK, all our down bags benefit from never having had their down compressed before use, maintaining the down’s loft and warmth.

Our Verdict

Rab’s Neutrino 400 Down Sleeping Bag is one of their key sleeping bags, designed for mountaineering, trekking and fast & light activities, its filled with high quality 800 Fill Power down with technical trapezoidal boxwall baffles and a differential cut which offsets the seams and eliminates cold spots.

The Neutrino bags use Pertex Quantum as the outer shell which is wind resistant making the Neutrino bags excellent all-rounders.

They are also a Tapered Mummy shape which means they are a bit ‘neater’ than your standard Mummy specification, so some people who don’t like being in a restrictive bag may not like them so much, however this type of design does make the bags more efficient as they reduce heat loss due to air movement inside the bag.

The rest of the bag is up to Rab’s high standard with features and construction to a very high standard.

– Reviewed by Ultralight Outdoor Gear

Features

• Weight saving chevron baffle design, reduces down migration and optimises core warmth.
• Trapezoidal boxwall construction with differential cut, to maximise loft and warmth 
• Close fitting adjustable neck baffle design for decreased heat loss 
• YKK 3/4 length main zip with synthetic filled baffle to trap warmth 
• YKK zipped internal stash pocket 
• Angled foot box for relaxed sleeping posture 
• YKK Anti-snag zip insert and anti snag internal zip guard 
• Hand-filled in Derbyshire UK 
• Zipped cotton sack with water-resistant base for home storage 
• Waterproof roll-top compression sack included 
• Tapered Mummy Shape

Specifications

Temperature Rating (EN(13537:2012)

• Comfort: -1°C / 30°F
• Comfort Limit: -7°C / 19°F
• Extreme: -25°C / -13°F
• Rab Sleep Limit: -7°C / 20°F

Regular Specs

• Weight: 821g (excludes storage bags)
• Fill weight: 400g
• Packed size: 35 x 23cm
• Overall length: 215cm
• Height of user: 185cm
• Internal shoulder girth: 160cm
• Internal hip girth: 134cm
• Internal foot girth: 102cm

Long Specs

• Weight: 890g (excludes storage bags)
• Fill weight: 435g
• Packed size: 35 x 23cm
• Overall length: 230cm
• Height of user: 200cm
• Internal shoulder girth: 162cm
• Internal hip girth: 136cm
• Internal foot girth: 104cm

Regular Wide Specs

• Weight: 854g (excludes storage bags)
• Fill weight: 435g
• Packed size: 35 x 23cm
• Overall length: 215cm
• Height of user: 185cm
• Internal shoulder girth: 180cm
• Internal hip girth: 146cm
• Internal foot girth: 110cm

Extra Long Wide Specs

• Weight: 940g (excludes storage bags)
• Fill weight: 470g
• Packed size: 35 x 23cm
• Overall length: 230cm
• Height of user: 200cm
• Internal shoulder girth: 182cm
• Internal hip girth: 148cm
• Internal foot girth: 112cm

Material & Construction

• Shell: 20D Pertex® Quantum recycled nylon ripstop (38gsm) with fluorocarbon-free DWR
• Lining: 20D Recycled Nylon (38gsm)
• Main: 100% recycled polyamide. Lining: 100% recycled polyamide
• Fill: 800FP R.D.S Certified European Goose Down with Nikwax fluorocarbon-free Hydrophobic Finish

Help & advice:

• The Ultimate Guide to Lightweight Sleeping Bags
• Time-Saver Guide to Choosing a Sleeping Bag
• About Rab
• Rab Down Sleeping Bag Range Explained
• The EN13537 Standard
• All About Down
• Hydrophobic Down
• Responsible Down Standard
• Recycled Content in Outdoor Gear
• Rab Sustainability and Responsibility