REI Co-op Flash 18 Pack

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Handy in town, on trails and for short hikes away from basecamp, the Flash 18 pack cleverly converts into a stuff sack when you turn it inside out.

  • Features

    • Lightly padded stretch-mesh shoulder straps are breathable and comfy
    • Back panel is lightly padded; pad slips out for use as a sit pad
    • Hipbelt and sternum strap can be detached
    • Sternum-strap buckle doubles as a safety whistle
    • Hydration-compatible design includes a hose exit port and an internal sleeve for a reservoir (reservoir not included)
    • Drawcord closure fully covers the top opening when cinched tight
    • Pack exterior has a zippered pocket and daisy chain with ice axe loop


    Our founders were mountaineers in search of a good ice axe. Tired of ordering from Switzerland, they started the Seattle co-op in 1938 to provide gear to their climber friends—by passing around a notebook. That sense of community is still central to the co-op today, where collective expertise from REI members and store employees informs the design of our products. This is gear built on purpose.
    View all REI Co-op Daypacks
  • Technical Specs

    Best Use


    Bag Style


    Frame Type




    Gear Capacity (L)

    18 liters

    Gear Capacity (cu. in.)

    1,100 cubic inches


    10 ounces

    Fits Torso Length (in.)

    16 - 19 inches

    Fits Waist/Hips

    26 - 42 inches


    Ripstop nylon

    Pack Access


    Number of Exterior Pockets

    1 main compartment

    Reservoir Compatible



    16 x 9.5 x 8 inches



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

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