REI Co-op Flash 45 Pack

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Designed for weekend backpacking trips, this ultralight pack provides an impressive level of carrying comfort for a pack this light—it's just over 2 pounds.

  • Features

    • Activflex LT perimeter frame combines tubular aluminum with flexible Delrin® side rods to allow torso rotation, yet efficiently transfer the load to the hipbelt
    • Freeflow LT back conforms to your back and has ventilation channels and a central breezeway to keep you cool
    • Streamlined shape fits close to the body for stability; over-the-top compression strap snugs loads close
    • Stretch front stash pocket accommodates bulky gear; mesh side pockets are perfect for water bottles
    • Tip grips are paired with speed hooks to securely hold trekking poles; pack also has multiple lash loops
    • Hydration-compatible design accepts most popular types of reservoirs (sold separately); you can route the sip tube over either shoulder
    • Stretch-mesh shoulder-strap pocket fits a camera
    • The REI Flash 45 Pack also includes handy hipbelt pockets where you can stash small trail essentials


    View all REI Co-op Backpacking Packs
  • Technical Specs

    Best Use


    Frame Type

    Internal Frame





    Frame Material


    Number of Stays


    Pack Access


    Number of Exterior Pockets

    3 + main compartment



  • Reviews
    37 reviews with an average rating of 4.1 out of 5 stars

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