Hydro Flask Unbound 15L Soft Cooler Pack

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The Hydro Flask Unbound Series 15L soft cooler pack is comfortable to carry on a hike or searching for the best spot at an outdoor concert, and it keeps your drinks and snacks ice-cold the whole time.

  • Features

    • Keep contents cold up to 48 hrs.; Advanced Thermal Mapping features more insulation at the bottom, delaying conductive temperature loss
    • True Access hinged top keeps the interior of the pack easy to access, allowing for quick packing and convenient cleaning; liner is FDA food-grade and BPA-free
    • Aquaseal® zipper and welded seams ensure leakproof transport
    • Storage pockets keep dry things dry and side pockets easily stash your keys or phone
    • Compression-molded base allows the pack to stand on its own
    • Woven sternum strap and handles; welded nylon attachment mounts


    View all Hydro Flask Backpack Coolers
  • Technical Specs

    Best Use



    Cooler Type


    Gear Capacity (L)

    15 liters

    Gear Capacity (cu. in.)

    915 cubic inches


    600-denier polyester with thermoplastic polyurethane coating


    Outside: 18.5 x 10.5 x 8; inside: 14.5 x 9.5 x 7 inches


    2 lbs. 14.4 oz.

  • Reviews
    192 reviews with an average rating of 4.7 out of 5 stars

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