Open main menu

Mountain Hardwear Ghost SL -40

rated 5.0 of 5 stars
photo: Mountain Hardwear Ghost SL -40 cold weather down sleeping bag

One of the warmest bags in the world — from a world class manufacturer — and made with high quality fabrics and well crafted. This extreme weather /survival sleeping-bag rated is rated to Minus Forty Degree's (-40F/-40C) and even if not used in those temperatures, it can make for a comfortable nights sleep especially for those that sleep cold or need to warm up quickly as soon as they get in their sleeping bags. This is a perfect product for high altitude mountaineering, polar and artic expeditions and here is my review, hope it helps!


  • One of the warmest sleeping bags on market
  • High quality construction, attention to detail
  • Compresses well due to high loft 800 fill down
  • For high altitude mountaineering, polar and artic extremes
  • Expedition ready for high alttitude or extreme weather
  • Waterproof outfabric
  • Tough and durable
  • Great for cold sleepers even in warmer tempertures.


  • Relatively heavy and takes up alot of space
  • expensive
  • Overkill, unless it's really cold out (at least -5°F or lower)
  • You will sweat in this bag if it's not that cold out (35-45°F)


This is a very roomy sleeping bag and has numerous pockets inside for cell phone, watch, earplugs or other small personal items (ipod, snack,etc..). There are very generous amounts of high quality 800 fill down throughout this bag and evenly spaced in all areas including around the head and feet and everywhere in between.

The zipper, although it might snag sometimes, is very durable and has a protective flap on the outside which can help shed snow or rain/water and on the inside part of the entire length of the zipper there is a long tube of down constructed as to make up the empty space where the zipper closes both side of the  bag together.

There are a few pull cords near the head and numerous velcro closures and button and neck collar. Obviously this bag was made with the harshest weather in mind and I cannot think of anything negative to say about the quality or construction or of any feature that could be missing.


This is a relatively heavy bag (when I compare it mentally to let's say my Marmot Plasma 15F which is 900 fill albiet 55 degrees warmer. Therefore, when tempertures/weather merit a super-warm expedition/extreme bag which can save your life; the Mountain Hardwear Ghost is well worth its weight and price.

It comes with both a compression sack which helps to get it down to a little bigger than a basketball and another bag to keep it loosely uncompressed. However, I hang mine on a hanger from higher up so the down can stay lofty.

Source: bought it new
Price Paid: $490

This is a first look that focuses on the fit and finish; i plan to post a follow-up review after taking this to deep cold weather, which i have not yet had the opportunity to do.

This is a winter expedition down sleeping bag, rated to -40 fahrenheit.  It is insulated with 800 fill down and has a waterproof/breathable outer shell made from conduit, Mountain Hardwear's proprietary membrane.  

i purchased a long size so i could stow some gear around my feet.  this bag replaced a synthetic fill expedition bag, also rated to -40f, which served me very well for a long time.  it weighs about five pounds.  

the design and manufacturing quality of this bag is uniformly outstanding. the zipper is backed by two full draft tubes and is covered on the outside with two stiffened parts of the outer shell that run the entire length of the zipper, and the fabric underneath the zipper is a thicker, more robust nylon to prevent snags.  

the draft collar around the neck is shaped to leave a little space in the middle and completely surrounds to prevent drafts.  the two ends of the collar attach with velcro near the zipper, and the scratchy velcro strip mates to an extra strip on the same size - so even if you don't use the velcro, the rough edge won't bother you.  

the hood cloaks your head - it is well-shaped and has a lot of down.  two elastic drawcords pull the collar and hood tight, leaving as much or as little of your face showing as you might want.  it has a small interior zippered pocket that holds a headlamp and a few other small items.  

the toe box is full and doesn't bother my size 11 feet.  It's a roomy bag at the shoulders, which i like a lot.  an interesting design feature is that the baffles are welded to the outer waterproof/breathable membrane rather than stitched - so no needle holes on the outside.  no down leaking anywhere.  

it comes with a compression stuff sack that isn't exactly small - but that is to be expected for an expedition bag.  

My only night out has been a backyard test run in 20 degree weather, one of the coldest nights we have had in the mid-atlantic this winter.  not surprisingly, i was roasting and slept with the bag partially unzipped.  

My initial impression is that Mountain Hardwear did this right, through and through.  more to come after a few truly frigid nights.

Price Paid: $529

Your Review

Where to Buy

Help support this site by making your next gear purchase through one of the links above. Click a link, buy what you need, and the seller will contribute a portion of the purchase price to support Trailspace's independent gear reviews.

You May Like


Regular Long
Price MSRP: $680.00
Historic Range: $376.99-$1,050.00
Reviewers Paid: $490.00-$529.00
Weight 4 lb 12 oz / 2160 g 5 lb 0 oz / 2270 g
Fill Weight 2 lb 10 oz / 1190 g 2 lb 12 oz / 1250 g
Loft 10 in / 25 cm 10 in / 25 cm
Temperature rating -40 F / -40 C -40 F / -40 C
Fill 800 fill-power down 800 fill-power down
Shape Mummy Mummy
Max User Height 6 ft 0 in / 180 cm 6 ft 6 in / 200 cm
Shoulder Girth 63 in / 160 cm 65 in / 165 cm
Hip Girth 59 in / 150 cm 61 in / 155 cm
Foot Girth 39 in / 99 cm 41 in / 104 cm
Price $680.00 USD $700.00 USD
Product Details from Mountain Hardwear »

Recently on Trailspace

Atlas Aspect Review

Nalgene 32oz Wide Mouth Ultralite HDPE Bottle Review