Mountain Hardwear HyperLamina Spark Sleeping Bag

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Winner of Backpacker magazine's 2015 Editors' Choice Award, this bag offers outstanding compressibility and excellent loft and warmth with zoned insulation and a half-length zipper to save weight.

  • Features

    • Backpacker magazine conducts rigorous field testing to select award winners in recognition of their innovation in design, materials and performance
    • Proprietary welded Lamina construction enhances loft and eliminates cold spots; zoned insulation maximizes warmth where it's needed most
    • Thermal.Q insulation has outstanding compressibility and maintains excellent loft and warmth, even when damp
    • Performance mummy cut is snug, reducing girth, weight and bulk while maximizing thermal efficiency
    • Comfort footbox follows natural foot position for maximum warmth and comfort
    • Face gasket and tailored hood comfortably block drafts at the hood opening and seal in warmth
    • Single #5 half-length center zip with dual sliders minimizes weight and allows for ventilation
    • Ultralight shell is soft and highly wind-resistant
    • Silnylon compression stuff sack and mesh storage sack 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 Men's Sleeping Bags
  • Technical Specs

    Best Use


    Tested Lower Limit

    32 degrees (F) - EN

    Tested Comfort

    41 degrees (F) - EN

    Temperature Rating (F)

    32 degrees (F)

    Temperature Rating (C)

    0 degrees (C)


    Tactel nylon

    Zipper Location


    Insulation Type



    Thermal.Q synthetic fibers


    20-denier taffeta

    Sleeping Bag Shape


    Stuff Sack Size

    6 x 12 inches

    Stuff Sack Volume

    5.6 liters

    Compressed Volume




  • Reviews
    38 reviews with an average rating of 4.5 out of 5 stars

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