Mountainsmith Circuit 3.0 Backpack

The Mountainsmith Circuit 3.0 backpack is a very large, internal frame, 6000 cubic inch model that's made out of strong and durable, reinforced nylon. The backpack has foam shoulder straps for comfort along with a molded foam back panel and foam pivoting waist belt. It also comes with four load adjusters for equal load dispersion, a single ice axe loop, trekking pole mounts, a safety whistle and a separate sleeping bag compartment. The Circuit 3.0 also has a detachable lid that converts into a lumbar and is hydration pack compatible.


  • Body fabric - 420 denier nylon and 840 denier Ballistics bottom
  • Approximate volume - 6000 cubic inches
  • Average weight - 5 lbs. 4 oz.
  • Fits torso - 18 - 22 inches
  • Dimensions - 33.5 x 18.5 x 17 inches
  • Frame material - HDPE aluminum


  • Dual density foam shoulder straps for comfort
  • Elastic sternum strap and bite valve catch
  • Molded foam back panel and pivoting waist belt
  • Four load adjusters for load dispersion
  • Collared storm shield with draw cord closure
  • Zippered vertical front pocket with elastic rigging
  • Internal organizer pockets and two water bottle pockets
  • Zippered side pockets with pass thru sleeves
  • Detachable lid that converts into a lumbarSingle ice axe loop
  • Hydration compatible with dual exit ports
  • Trekking pole mounts
  • Safety whistle included
  • Separate sleeping bag compartment with internal divider
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