Open main menu

Deuter Neosphere -15°

rated 5.0 of 5 stars
photo: Deuter Neosphere -15° cold weather down sleeping bag

Excellent bag up to - 15° C.


  • Highly compressible
  • Light enough
  • Does not take much room


  • Fill power could have been better


It is a German brand as you all know, but the bag is Chinese made, a very good one indeed. Unfortunately it still is not sold in the U.S. market. It comes in two sizes; regular (6'), long (6.6'). It weighs approximately 3 pounds and 8 ounces. The outer shell is Deuter-Diamond 30D Nylon and the inside lining is Tactel Nylon.

It is a new model down sleeping bag with amazingly good insulating qualities. Thermo Stretch Comfort System on the inside: the lining which is soft Tactel Nylon, is constructed with elastic seams allowing to expand up to 25 % in width. However, the shell has a roomy cut and thus not only keeps the loft of the down, but enhances the insulation by providing even more space for the down to expand.

Manufacturer claims that compared to other down sleeping bags without Thermo Stretch Comfort, this particular insulation construction improves the inner temperature at an average of 2°C. The head and foot section are ergonomically cut. The 3D hood protects the sleeper’s head, while the Ergo Foot cut with its extra thick fill in three chambers guarantees warm feet. Trapezoid chambers keep the down evenly distributed and prevent cold spots. Warmth-to-weight ratio is relatively good.


  • Functional contoured hood with different draw cord systems,
  • Warmth collar with Velcro closure and elastic cord,
  • 2-way full-length YKK zips and down filled draft tube all along the zipper to prevent the outside colder temp from seeping inside the bag, anti-catch strip,
  • Inner valuables pocket,
  • Dryzone in the head and foot section with a water repellent outer layer to protect from damp,
  • Compression packsack and additional storage sack.
  • 675+ fill power
  • Comfort range: 18°F, Limit: 0°F

I slept in the bag last weekend at 8400 feet during a summit attempt, temperature was around -5 to -7 C and I was amazingly cozy inside the bag. I realized how cold the outside was when I got out of the tent to pee. It was so cold that the moment I got out of the tent with my coat on of course, I started shivering uncontrollably until entering back to the tent and into the bag.

The bag itself is good up to and maybe a little bit below 0°F, but the temperature compatibility can easily be improved, using a Mylar bag inside. It is sold in the range of $475 - $520 in Europe. The compatible models and brands are available in the US market, so I am not gonna say you can consider this one as a good alternative to this and that. I am glad to have it.

Source: bought it new
Price Paid: none (project financing)

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

Product Details from Deuter »

Recently on Trailspace

Patagonia Light Farrier's Shirt Review

Patagonia Iron Forge Hemp 5-Pocket Pants Review