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Alpine Down Winter Sleeping Bag (-5°F & -40°F)

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Alpine Down Winter Sleeping Bag (-5°F & -40°F)

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Designed for artic conditions+ View tech specs
  • Temp Rating
  • Size
Shipping & Returns

Our warehouse is actively shipping orders from 8am to 1pm MST Monday through Friday. Most orders ship in one business day, but the transit time can take up to 7 days, depending on your distance from Boulder, Colorado.

2nd Day and Next Day Air orders will ship same day if placed by 1pm MST, Monday-Friday (except holidays).

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'-5°F || Alpine Down Winter Sleeping Bag
Alpine Down Winter Sleeping Bag (-5°F & -40°F)
Description || Alpine Down Winter Sleeping Bag


The Alpine down mummy sleeping bag is designed for the rarefied world of high-altitude and arctic conditions. It features cutting-edge materials, the highest quality Ultra-Dry down, and complex construction. Expedition mummy sizing allows you to wear extra clothing, and boot liners inside the bag.

If you are going above or beyond, the Alpine is the bag you will want to take with you.

Design Details



Tech specs

  • Best Use
  • Comes With
    Ultra-Sil Compression Sack & Storage Cube
  • Insulation
    Ultra-Dry Down 850+ Loft
  • Season Rating
  • Shape
  • Shell Fabric
    Water repellent NanoShell
  • Zip Options
    Free-Flow zipper system
-5°F Regular-5°F Long-40°F Regular-40°F Long

Frequently Asked questions

Is this sleeping bag warm enough for cold-weather use?

Yes, this is a great sleeping bag for cold-weather camping. The Alpine -40° bag features a high-lofting down, technical hood, oversized draft tubs, and draft collar to keep you warm on the coldest nights. And, Alpine -5°F is designed for the extreme cold of alpine expedition use. We recommend Ascent/Altitude or ultralight Spark/Flame sleeping bags for occasional cold-weather use..

Can this sleeping bag be used in bivvies?

Yes! This sleeping bag features a NanoShell shell fabric that's windproof and highly water-resistant to protect the Ultra-Dry Down from external moisture.

Can this sleeping bag be zipped to another sleeping bag?

Unfortunately, the Alpine sleeping bag is not designed to be joined with another bag.

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