Mountain Hardwear Phantom Alpine 15 Sleeping Bag

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While you stay warm and tied in, dual side zippers on the Mountain Hardwear Phantom Alpine 15 sleeping bag allow openings for your harness so you can securely sleep, boil water and rack gear.

  • Features

    • High-lofting 850-fill-power down certified to the Responsible Down Standard (RDS) keeps you warm and toasty
    • 10-denier recycled ripstop nylon shell is extremely light and highly compressible
    • Lightweight but extra durable, 20-denier Pertex Y-Fuse fabric on underside of bag and footbox increases longevity while adding almost no extra weight
    • Tuck stitching protects baffle stitches from abrasion, adding to the durability of the bag over time
    • Lightweight and durable #5 zippers with antisnag for easy entry and exit
    • Dual side zippers with triple sliders allow arms and hands to move freely outside the bag without losing warmth inside the bag
    • 3D anatomically contoured footbox follows natural foot position for maximum warmth and comfort
    • High-perfomance mummy cut fits close to the body for thermal efficiency
    • Nylon compression sack and mesh storage bag included
    • Down-filled face gasket with cinch comfortably blocks drafts at the hood opening
    • Glow-in-the-dark, reflective zipper pull is easy to find at night
    • Durable water repellent (DWR) finish helps moisture bead up on the surface to keep the bag dry


    Note: Although the size menu on this page indicates "Left Zip," this bag comes with dual zippers—one on the left, one on the right.

    Many sleeping bags are rated for temperature by an independent testing protocol. REI and the broader industry now use the International Organization for Standardization (ISO) 23537 protocol, which improves on the older European Norm (EN) 13537 standard; you may still see older items in our assortment that were only EN tested. With either protocol, each bag gets a Comfort (or T-Comfort) rating and Lower Limit (or T-Limit) rating. The Comfort rating is the lowest temperature at which the bag will keep the average "cold sleeper" comfortable, and the Lower Limit rating is the lowest temperature at which the bag will keep the average "warm sleeper" comfortable. Ratings are based on a person wearing one long underwear layer and a pair of socks, sleeping on an insulated surface with a minimum R-value of 5.38. Many brands use the Comfort rating for women's bags and the Lower Limit rating for men's and unisex bags. Everyone's body and sleep comfort differ, and conditions of use (posture, clothing, sleeping pad R-value, wind, humidity, etc.) affect total insulation, so EN and ISO ratings are intended as a guideline to help you compare products, rather than a guarantee of warmth.
    View all Mountain Hardwear Men's Sleeping Bags
  • Technical Specs

    Best Use


    Tested Lower Limit

    15 degrees (F) - ISO

    Tested Comfort

    26 degrees (F) - ISO

    Temperature Rating (F)

    15 degrees (F)

    Temperature Rating (C)

    -9 degrees (C)




    10-denier recycled ripstop nylon; fabric accent: 20-denier recycled ripstop nylon Pertex

    Zipper Location


    Insulation Type



    Goose down


    10-denier recycled ripstop nylon

    Sleeping Bag Shape


    Stuff Sack Size

    15 x 7 inches




    Contains materials that meet the bluesign® criteria

    Down certified to the Responsible Down Standard (RDS)

    Contains recycled materials

  • Reviews
    15 reviews with an average rating of 4.7 out of 5 stars

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