Outdoor Research Molecule Bivy Sack

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Delivering the weather protection you need while cutting the weight you don't, this ultralight bivy lets you sleep soundly all night in a snug shelter that's perfect for fast-and-light solo trips.

  • Features

    • Waterproof, breathable Ventia fabric, taped seams, classic clamshell design and overlapping zipper opening let you breathe freely without letting in the weather
    • Durable, waterproof, 70-denier floor with antifungal coating stands up to many seasons of high adventure
    • Vented, high-volume footbox promotes air circulation and minimizes condensation
    • No-see-um netting ensures a bug-free night
    • Multiple stake loops and guyline loops
    • Small internal mesh pocket


    View all Outdoor Research Bivy Sacks
  • Technical Specs

    Best Use



    3 - 4-season

    Sleeping Capacity


    Packed Size

    5 x 14 inches

    Shoulder Width

    25.4 inches



  • Reviews
    21 reviews with an average rating of 4.0 out of 5 stars

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