Mountainsmith Boreas 40 Degree Sleeping Bag

Item # MNS92201   |    Bookmark and Share

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Reg. Price: $89.94

Sale Price: $71.95

You save $17.99 (20%)

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  • Mountainsmith Boreas 40 Degree Sleeping Bag
  • Mountainsmith Boreas 40 Degree Sleeping Bag - 1

Key Features

  • Rectangular shape
  • Right-hand zipper
  • Offset quilt construction
  • Hood extension
  • Calf-length, two-way locking zipper
  • Full-length draft tube
  • Anti-snag zipper reinforcement
  • Contoured footbox
  • External hang loops for drying or pad lashing
  • Compression stuff sack included
  • Cotton storage sack included


Recommended Use: Warm Weather Backpacking and Camping
Item Weight: 2 lbs 4.5 oz
Type: Synthetic
Packed Size: 16" x 9"
Shell Material: 75D x 240T Diamond Poly Ripstop
Liner Material: 50D x 290T Taffeta Poly Liner
Fits to Length: 82"
Fits to Girth: 65"
Fill Material: Mountainloft Hollowfibers
Temperature Rating: 40 Degrees F
Other: Stuff Sack Included
Warranty: Lifetime

Product-Related Videos

  • Product Demo
    Mountainsmith Boreas 40 Sleeping Bag   Mountainsmith Boreas 40 Sleeping Bag
  • Tech Talk
    Mountainsmith Synthetic Sleeping Bags   Mountainsmith Synthetic Sleeping Bags

Product Highlights

The Mountainsmith Boreas 40 Degree sleeping bag balances reliable performance and affordability. A roomy rectangular cut and synthetic fill make the Boreas 40 Degree a comfortable option for mild-weather camping or backpacking.

Weighing 2 pounds, 4.5 ounces, the Boreas 40 Degree is insulated with compressible, MountainLoft Hollowfiber synthetic fill. Though still not as compressible as natural down fill, breathable and fast-drying MountainLoft, unlike down fill, is water-resistant and continues to provide warmth even when wet. This is particularly important if you encounter wet weather or humid climates.

Quilted construction and a differential cut for optimal loft help eliminate cold spots, keeping outside air from reaching the interior of the Boreas 40 Degree. This type of quilt construction is durable and maintains its shape and structure even after many uses. A draft tube behind the calf-length, two-way locking zipper and a insulated hood further enhance the thermal efficiency of the Boreas 40 Degree bag.

The Mountainsmith Boreas 40 Degree sleeping bag is available in a single length that fits up to 6' 6". Each Boreas 40 Degree bag includes a compression stuff sack and a cotton storage sack.

Mountainsmith part number: 12-1049-04