REI Co-op Mars 80 Pack

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Built to handle heavy loads with all the creature comforts, the newly updated REI Mars 80 pack handles extended backpacking in any season.

  • Features

    • Precurved shoulder straps match your anatomy for nonbinding comfort on and off the trail
    • With a "rip-and-stick" torso adjustment, shoulder strap system easily slides along pack's frame to fit torsos of varying lengths
    • Dual-density foam padded back panel provides a comfortable and supportive fit when carrying heavy loads
    • Precurved hipbelt is designed to cradle hip bones for a natural fit and to distribute weight without sagging
    • Hipbelt webbing system allows you to use a natural forward pulling motion for quick, easy cinching and precise adjustment
    • Enjoy dual access to pack via the top-loading opening and the horseshoe-shape, zippered front panel opening, which works like a duffel opening
    • Removable top lid pocket with water repellent zipper lets you stash the essentials you want to bring into tent; pack can stay outside or in vestibule
    • Zippered pocket under lid stores maps and keys, spare batteries and other small essentials
    • Front panel features a new and improved stretch-woven zippered pocket with easy access for packing often-used gear
    • Internal sleeping bag compartment is created by a zippered divider, separating it from gear and clothes in the main compartment
    • Utilizing 4 buckles, the pack's streamlined compression system lets you cinch and strap down loads for jostle-free carrying
    • Concave head pod at the top of pack gives your head freedom of movement—no more staring at the ground
    • 2 mesh side pockets hold water bottles, energy bars and other essentials you want close at hand
    • Side hipbelt pocket stores those small essentials you want at your fingertips, such as lip balm and sunscreen
    • Lash points on the other side of hipbelt let you attach camera and GPS pouches
    • Lash straps on bottom of pack let you attach sleeping pad
    • Hydration-compatible design features an internal reservoir sleeve and dual exit ports for drinking tube (hydration reservoir sold separately)


    View all REI Co-op Backpacking Packs
  • Technical Specs

    Frame Type

    Internal Frame

    Adjustable Torso Length


    Number of Stays


    Pack Access

    Top front

    Number of Exterior Pockets

    7 + main compartment

    Best Use




    Frame Material


    Suspended Mesh Back Panel


    Sleeping Bag Compartment




  • Reviews
    68 reviews with an average rating of 4.3 out of 5 stars

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