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Rab Neutrino 400 Down Sleeping Bag (-8C)

Rab Neutrino 400 Down Sleeping Bag (-8C)
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Intended for situations where warmth-to-weight is a primary concern, the Neutrino 400 is well suited to summer alpine trips and long multiday treks.

The Neutrino range comprises lightweight, minimalist down-filled sleeping bags. Refined to maximum warmth without increasing weight, the updated design has chevron shaped baffles to ensure the down is held over the centre of the body and prevents down migration while the trapezoidal chambers eliminate cold spots.

Perfect for summer alpine climbing, the Neutrino 400 is hand filled in Derbyshire and contains the highest quality 800FP ethically sourced European Goose Down. It is made using the lightweight, yet durable Pertex® Quantum - this allows the bag to have an impressively small pack size but quickly loft for instant warmth. The ‘mummy taper’ shape and angled footbox keep overall weight low without compromising on warmth or comfort and still allow for movement.

The Neutrino 400 has an ergonomically designed, close-fitting internal collar with a hood drawcord, as well as a 3/4 length YKK anti-snag zip with an insulating draft tube to keep out the cold. Other features include a handy internal stash pocket, dry bag compression stuff sack for transport and cotton sack for storage.

Weight : 775g / 1.71lbs
Fill : 800FP R.D.S. Certified European Goose Down
Fill Weight: 400g / 14.1oz

  • Pertex® Quantum outer fabric

  • Lightweight Nylon Ripstop inner fabric

  • 800FP R.D.S Certified European Goose Down

  • Rab Fluorocarbon free Hydrophobic Down developed in conjunction with Nikwax

  • 775g / 27.3oz saving baffle construction, preventing down shift/migration

  • Mummy taper shape

  • Proportionally designed differential cut

  • Trapezoidal chamber design to eliminate cold spots

  • 3/4 length YKK® 5 coil main zip with full length baffle and noctilucent pullers

  • Internal stash pocket

  • Anti snag bonded zip guard

  • Ergonomically designed internal collar

  • Internal 3D collar and hood drawcord

  • Angled foot box

  • Dry bag compression stuff sack

  • Cotton storage sack

  • Temperature tested to new European standard: EN1357:2016

  • Filled in Derbyshire UK

  • Pack Size: 36 x 19cm/14.2 x 7.5 inches

Recommended Use



Early Spring to Late Fall

Temperature Rating

-8C / 17.6F


Performance Mummy

Insulation Type

800FP R.D.S Certified European Goose Down


775g / 27oz

Fill Weight

400g / 14.1oz

Fits to User Height

185cm / 72.8in


215cm / 86.5in

Width – Shoulder

70cm / 27.5in

Width - Hip

52cm / 20.5in

Width - Foot

41cm / 16.0in

Fabric – Shell

Pertex® Quantum:,30g/m²,15d/15d,100% nylon

Fabric – Lining

30g/m²,15d/15d,100% nylon

Comes With

Dry bag stuff sack and cotton sack for storage

It’s been over 30 years since the first Rab sleeping bag was hand cut, sewn and filled in a small terraced house in Sheffield. Having spent years in the mountains Rab Carrington’s original designs were inspired by his experience. Making products for climbers by climbers, function and performance lay at the heart of his designs.

Filled, stitched and finished in Derbyshire, his same values have been carried forward to the present day. By paying attention to the smallest detail and simplest innovation, they remain committed to making sleeping bags that will last a lifetime.

Pertex® Quantum uses a tightly woven structure to provide a light and soft fabric that allows insulation to fully loft. With down proof construction, a DWR finish and soft feel, it's a lightweight and packable windproof fabric offering excellent weather protection.


Pertex® Quantum

Pertex® Quantum uses a tightly woven structure to provide a light and soft fabric that allows insulation to fully loft.