Flex Capacitor 40-60

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Expand your gear, extend your adventures

The lightweight backpack of your dreams is here. Meet the versatile pack that hauls it all. The Flex Capacitors is a beast of backpacking pack, constructed from durable nylon for rough conditions in the backwoods and built with adjustability in mind. Loosen the expanding horizontal gussets for an additional 15-20L of cargo capacity on longer backpacking trips, or cinch it tight for smaller, compact loads on fast summit days. Plus, ample quick-stash solutions on the straps, sides and bucket lid ensure there are plenty of places to store your mid- trail essentials. However, you pack it, the Y-Flex suspension adds support so this lightweight backpacking backpack can hit well above its weight class. Flex Capacitor Rain Cover sold separately. 


  • Lightweight Y-Flex Suspension provides superior increased support.
  • 20L adjustable volume to tailor both to extended backpacking trips or shorter day trips.
  • Hydration sleeve doubles as removable summit sack.
  • Dual adjusting shoulder straps tailors pack fit to your torso.
  • 2 hydration pockets on shoulder straps.
  • 2 stretch mesh side pockets to keep essentials close at hand .
  • Zippered hip belt pockets for easy storage.
  • U-shaped top access zipper for easy access while backpacking.
  • Lightweight backpack.


  • 100D Nylon Honeycomb/420D Oxford

Tech Specs

S/M Torso

  • Capacity: 40-60L / 2441-3661 in3
  • Weight: 2 lbs 12 oz  / 1.23 kg
  • Torso Fit: 16" - 19" / 41 - 48 cm
  • Hip Fit with S/M waist belt: 
  • Dimensions (H x W x D): 25" x 12.5" x 12.5" / 63 x 20 x 32 cm
  • Suspension: Lightweight Y-Flex 

M/L Torso

  • Capacity: 40-60L / 2441-3661 in3
  • Weight: 3 lbs 2 oz  / 1.4 kg
  • Torso Fit: 18" - 21" / 46 - 53 cm
  • Hip Fit with M/L waist belt: 
  • Dimensions (H x W x D): 27.5" x 8.5" x 12.5" / 70 x 22 x 32 cm
  • Suspension: Lightweight Y-Flex