Flex Trail 40-60

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Big adventures made lighter

Explore like a pro no matter your experience level. The Flex Trail ultralight backpack gives you the ability to tailor the pack size to your adventure needs by taking advantage of the horizontal gussets. Cinch it down to a 40L cargo pack capacity for your shorter trips. Expand it out to 60L for your longer backpacking adventures. Continue to customize your backpack with the hardware-based adjustable torso. Keep your essentials close at hand with oversized mesh pockets and zippered hip pockets. The aluminum perimeter frame suspension keeps this backpacking pack lightweight while the support stays strong.


  • Expandable volume to adjust to both short and longer backpacking adventures
  • Lightweight aluminum perimeter frame for increased stability
  • Customizable fit with a hardware based adjustable torso
  • Large front stretch mesh Shove-It pocket to easily store jackets and other day essentials
  • Zippered hip belt pockets and 2 stretch mesh side pockets for storing water bottles and items you need to keep on hand
  • U-shaped access to top zipper and zip stash pocket in lid to store items for easy access
  • Ultralight backpacking backpack


  • 150D Polyester Ripstop / 420D Polyester

Tech Specs

  • Capacity: 39-56L / 2380-3417 in3
  • Weight: 2 lbs 12 oz  / 1.23 kg
  • Optimal Carry Weight: 15-45 lbs / 7-20 kg
  • Torso Fit: 15.5" - 21" / 39 - 53 cm
  • Waist Belt Size: 31" - 54" / 31 - 54 cm
  • Dimensions (H x W x D): 27.5" x 10.5" x 14" / 70 x 27 x 35 cm
  • No. of Hip Belt Pockets: 2
  • No. of Exterior Pockets: 5