Mountain Hardwear Phantom 15 Sleeping Bag

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Ideal for high-alpine traverses and backcountry hut trips, the Mountain Hardwear Phantom 15 down sleeping bag offers warmth and light pack weight to climbers, skiers and backpackers.


  • Lofty 850-fill-power down certified to the Responsible Down Standard (RDS) provides optimal warmth-to-weight ratio and compressibility
  • 10-denier recycled ripstop nylon shell is extremely light and highly compressible
  • Tuck stitching protects baffle stitches from abrasion, adding to the bag's longterm durability
  • Lightweight and durable #5 antisnag zipper offers easy entry and exit; 2-way zipper action allows for easy ventilation
  • 3D anatomically contoured footbox follows natural foot position for maximum warmth and comfort
  • Oversize, insulated draft collar blocks the escape of warm air from inside the bag
  • Performance mummy cut fits close to the body and is thermally efficient
  • 4-chamber hood design maintains even loft around head for consistent warmth
  • Lightweight nylon compression sack and mesh storage sack 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
  • This left-zip bag can zip together with a compatible right-zip bag (not included)


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 Backpacking Sleeping Bags

Technical Specs

Best Use


Tested Lower Limit

11 degrees (F) - ISO

Tested Comfort

23 degrees (F) - ISO

Temperature Rating (F)

15 degrees (F)

Temperature Rating (C)

-9 degrees (C)




10-denier recycled ripstop nylon

Zipper Location


Insulation Type



Goose down


20-denier nylon taffeta

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

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