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Rab Neutrino 400 - Women's Review

This lightweight sleeping bag is a great choice for alpine climbing or fast and light adventures
rab neutrino 400 for women sleeping bag review
Credit: Rab
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Price:  $400 List | $400.00 at REI
Pros:  Lightweight, compressible, comfortable
Cons:  Expensive, not particularly warm
Manufacturer:   Rab
By Jessica Haist ⋅ Review Editor  ⋅  Jun 7, 2022
Our Editors independently research, test, and rate the best products. We only make money if you purchase a product through our links, and we never accept free products from manufacturers. Learn more
75
OVERALL
SCORE


RANKED
#6 of 17
  • Warmth - 25% 5.0
  • Weight - 25% 9.0
  • Comfort - 20% 8.0
  • Packed Size - 15% 9.0
  • Features - 15% 7.0

Our Verdict

The Rab Neutrino 400 - Women's is a high-quality bag with a good warmth-to-weight ratio. It only weighs in at 28 ounces, right up there as one of the lightest bags in this review. This female-specific sleeping bag has more down per square inch than its male counterpart and is hand filled with high-quality 800 fill power Nikwax Hydrophobic Down. It is very compressible, and we love its included stuff sack. The Neutrino is not as warm as the other top contenders, having less down fill than other bags that are as light and for this, it has slowly dropped down in our rankings. We think it's a great choice for summer lightweight backpacking trips.

Compare to Similar Products

 
Awards  Editors' Choice Award Best Buy Award   
Price $400 List
$400.00 at REI
$569 List
$489.00 at Feathered Friends
$340 List
$339.95 at Amazon
$259.24 at Backcountry
Compare at 2 sellers
$179 List
$168.95 at Backcountry
Overall Score Sort Icon
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Star Rating
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Pros Lightweight, compressible, comfortableHigh-quality down, warm, lightweightComfortable, lightweight, excellent materials, not constrictingComfortable, warm, roomyComfortable, inexpensive, recycled materials
Cons Expensive, not particularly warmSizing not for everyone, fabric is a bit noisyComforter sometimes does not stay tucked inHeavy, bulkyHeavy, bulky
Bottom Line This lightweight sleeping bag is a great choice for alpine climbing or fast and light adventuresThis high-end bag will keep you warm and comfortable from Spring to Fall in all conditionsA great, high-quality choice at a relatively low price for those looking for a lightweight bag that doesn't sacrifice comfortThis middle-of-the-pack sleeping bag is comfortable, warm, and fine or short backpacking trips and car camping excursionsThis well priced synthetic bag is a great choice for your car camping needs
Rating Categories Rab Neutrino 400 -... Feathered Friends E... Sierra Designs Clou... Mountain Hardwear B... Marmot Trestles Eli...
Warmth (25%)
5.0
10.0
5.0
8.0
5.0
Weight (25%)
9.0
9.0
9.0
6.0
5.0
Comfort (20%)
8.0
8.0
8.0
8.0
9.0
Packed Size (15%)
9.0
8.0
9.0
7.0
5.0
Features (15%)
7.0
9.0
8.0
6.0
7.0
Specs Rab Neutrino 400 -... Feathered Friends E... Sierra Designs Clou... Mountain Hardwear B... Marmot Trestles Eli...
ISO/EN Comfort Rating 30 F 20 F (not EN rated) 26 F 15 F 20 F
Fill Type Goose down Goose down PFC-Free DriDown 650-fill-power down HL-ElixR synthetic fibers
Measured Weight 1.8 lbs 1.7 lbs 1.7 lbs 2.5 lbs 2.8 lbs
Total Weight 28.0 oz 27.5 oz 27.4 oz 39.7 oz 44.0 oz
Fill Power 800 950+ 800 650 Synthetic
Women specific features Women's specific fit Extra fill in footbox and chest More insulation per square inch than men's version Additional insulation Women's specific fit
Fill Weight 14.2 oz 17.3 oz (medium) 14.8 oz Unspecified Unspecified
Material Pertex Quantum Pertex Endurance UL 15d nylon risptop 20D Ripstop Nylon 20-denier recycled ripstop polyester
Neck Baffle Yes Yes No Yes Yes
Pocket Yes No No Yes Yes
Sleeping Pad Sleeve No No Yes No No
Zipper Length 62 in 62 in N/A 66 in 53/15 in
Shoulder Girth 60 in 54 in 59 in 60 in 58 in
Hip Girth 56 in 56 in 58 in 50 in 58 in
Foot Girth 38 in 38 in 39 in 40 in 45 in
Stuff Sack included? Stuff sack and storage bag included Stuff sack and storage bag included Stuff sack and storage bag included Stuff sack and storage bag included Stuff sack and storage bag included

Our Analysis and Test Results

This lightweight, minimalist bag is packed with 800 fill power ethically harvested Nikwax Hydrophobic down. It packs down small, is lightweight, and keeps you warm in summer conditions. The Neutrino is an ideal summer bag for a frequent backpacker or alpine climber.

Performance Comparison


rab neutrino 400 for women sleeping bag review - the rab neutrino will keep you cozy on all your summer backpacking...
The Rab Neutrino will keep you cozy on all your summer backpacking adventures.
Credit: Jessica Haist

Warmth


The Neutrino is a warm sleeping bag, but not the warmest of the bunch. Rab notes that it has an EN rated at 30°F for comfort, with a limit of 27°F; we find the EN limit rating of 30°F to be right on the money. We tested this bag in Yosemite Valley on some cold shoulder-season nights, where temperatures fell below freezing some mornings, and we felt warm in this bag inside a tent, on a warm sleeping pad. Its redesigned chevron-shaped baffles are meant to keep down in place over your body and eliminate cold spots more effectively. We can't say we noticed a difference with this change.

Rab makes their women's sleeping bags 5 to 7 inches shorter in length and slightly slimmer than their men's sleeping bags, but they use the same amount of down fill for both. This means that the women's bag has more down per square inch and is warmer than the men's version. The cozy neck baffle and draft tube along the zipper kept out the cold air well. Pair it with a lightweight air mattress and you'll have a great lightweight, compact, 3-season backpacking sleeping kit. The Neutrino only has 14 ounces of 800 down fill, but it should be said that it is just as warm as the other down sleeping bags we tested with lower quality 650 fill.

Weight


Weight is the category where the Neutrino excels. Rab has made a great effort to minimize the weight of this sleeping bag by paring down its features and materials, but still retains the necessities.

rab neutrino 400 for women sleeping bag review - the rab neutrino is a great choice for fast and light adventures.
The Rab Neutrino is a great choice for fast and light adventures.
Credit: Jessica Haist

Weighing only 28 ounces, or 1.75 pounds, it is a pleasure to pack this sleeping bag in your backpack. By using high-quality down, the bag can be very toasty without being bulky or heavy. We think that Rab could have used a ¾-length zipper as they have on past Neutrino models to cut down the weight of this bag even more. The shell material is very lightweight, which is great for weight savings, but is consequently quite delicate and seems more prone to molt down, which is a drawback.

Comfort


The Neutrino is very comfortable. It is on the roomy side for a mummy bag, and we never felt constricted. Its shell and liner fabrics feel light and soft against the skin as well. The bag even has an ergonomically shaped foot box so there is space for your feet as well as any wet socks or boot liners you may want to stuff in there to dry overnight.

rab neutrino 400 for women sleeping bag review - the rab neutrino's draw-cord is sometimes difficult to use and we...
The Rab Neutrino's draw-cord is sometimes difficult to use and we wish there were different materials for the top and bottom cords.
Credit: Jessica Haist

Packed Size


Once again, the high-quality down is to this bag's benefit, because it compresses to a small size. Rab has changed the Neutrino's stuff sack this iteration. It is a much larger roll-top design that may be water-resistant but it is less easy to compress the bag down in this large sack. This bag could potentially be compressed more with a traditional compression sack if you need to create even more space in your pack. It also comes with a cotton storage sack so you can store it away uncompressed to help keep its loft.

rab neutrino 400 for women sleeping bag review - the neutrino's stuff sack is larger than previous versions and we...
The Neutrino's stuff sack is larger than previous versions and we believe it can compress much smaller than this size.
Credit: Jessica Haist

Features


At first glance, this bag does not appear to have many distinct features. It is just a big blue tube. But look closer, and you will discover that many features are hidden just below the surface — literally. The main feature that Rab has introduced for its Neutrino line is Nikwax Hydrophobic down. This down treatment has been specially formulated between Rab and Nikwax in an attempt to make the down absorb less water, dry faster, and retain its loft longer. This treatment does not make the bag waterproof, nor does it take the place of synthetic insulation in wet conditions, but rather allows the bag to function at a higher level for a longer period when the weather is not ideal. Most down sleeping bags we tested now come with some hydrophobic down.

rab neutrino 400 for women sleeping bag review - we like the neutrino's small stash pocket, one of it's few distinct...
We like the Neutrino's small stash pocket, one of it's few distinct features.
Credit: Jessica Haist

The Neutrino also has more visible features like the small stow pocket for you to stash your headlamp or contact case on cold nights. We found the drawcords around the face and neck awkward to use and wish they used two separate diameter cords, they have slightly improved in the newest iteration of this product, but they're still not great.

rab neutrino 400 for women sleeping bag review - we like the neutrino's snag proof zipper pull.
We like the Neutrino's snag proof zipper pull.
Credit: Jessica Haist

For those of you with a vegetarian's conscience, all of Rab's down products are traceable under the European Down and Feather Association Codex, which means that the down is ethically sourced, ensuring that it is a by-product of a slaughterhouse or harvested during molting periods, not illegally live-plucked.

Value


This is one of the more expensive bags in the review, not quite as much as those right at the top of our scoring. Our testers love this bag and think it has a lot of great features to compete with some of the lighter sleeping bags on the market. However, this is no longer the only competitor in the lightweight women's category and is no longer a great value. We think there are a few bags that are less expensive, but just as great.

rab neutrino 400 for women sleeping bag review - want a small and compressible bag for your minimalist trips? the...
Want a small and compressible bag for your minimalist trips? The Neutrino may be right for you!
Credit: Jessica Haist

Conclusion


This bag is constructed with high-quality materials and is warm, comfortable, and quite versatile. It is hand-stuffed with 800 fill Nikwax Hydrophobic down and is among the lightest and smallest bags in this review. It's not quite as warm or high-quality as our Editor's Choice winner, but we still love this bag. Remember, ounces equal pounds and pounds equal pain - so save yourself some pain and go with lightweight gear when you can.

Jessica Haist
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