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.


  • 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


Temperature ratings are intended as a guideline to help you compare products, rather than a guarantee of warmth, since many different factors contribute to your comfort while you sleep. Backpacking bags are typically rated for temperature according to an independent testing protocol—currently International Organization for Standardization (ISO) 23537, though some older items followed European Norm (EN) 13537. Testing is based on a person wearing one base layer and a pair of socks, sleeping on an insulated surface with a minimum R-value of 5.38.

Each bag then gets 2 ratings: 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. Some brands determine their own temperature rating by aligning to the Comfort rating for women’s bags, to the Lower Limit rating for men’s bags, or somewhere in the middle for nongendered bags.
View all Mountain Hardwear Backpacking Sleeping Bags

Technical Specs

Item #880094
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




37 reviews with an average rating of 4.5 out of 5 stars

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