Mountain Hardwear Lamina Z Spark Sleeping Bag

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A great choice for 3-season backpacking, this roomy synthetic sleeping bag is lightweight and compressible, with thermally zoned insulation to put extra warmth around your core and feet.

  • Features

    • Unique welded construction reduces weight and bulk, maximizes insulation loft, eliminates cold spots and thermally maps insulation to areas where warmth is needed most
    • Thermal.Q insulation has outstanding compressibility, maintains excellent loft and continues to insulate even when damp
    • Comfort mummy cut maximizes warmth and fit while minimizing weight
    • Ergonomic draft collar and tailored hood with face gasket comfortably block drafts and seal in warmth
    • Comfort footbox follows natural foot position for maximum warmth and comfort
    • Soft polyester lining wicks away moisture and lightweight nylon shell has a durable water repellent finish to ward off moisture
    • Full-length #5 zipper with double sliders for versatile ventilation
    • Zippered pocket at shoulder
    • Nylon compression stuff sack and mesh storage bag included
    • 34³F EN (European Norm) lower-limit rating is suitable for 3-season use


    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

    34 degrees (F) - EN

    Tested Comfort

    42 degrees (F) - EN

    Temperature Rating (F)

    34 degrees (F)

    Temperature Rating (C)

    1 degrees (C)


    30-denier ripstop nylon

    Zipper Location


    Insulation Type



    Thermal.Q synthetic fibers

    Fill Weight

    1 lb. 4 oz.


    40-denier polyester taffeta

    Sleeping Bag Shape


    Stuff Sack Size

    6 x 12 inches



  • Reviews
    23 reviews with an average rating of 4.6 out of 5 stars

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