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Item # SDE1G201M

Sierra Designs Flex Capacitor 60L-80L (2023) Internal Frame Backpack

Purchase Flex Capacitor 60L-80L (2023)

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What the heck? Yep, the innovative, lightweight Sierra Designs Flex Capacitor 60L-80L pack has a look all its own and its gusseted compression system lets it swiftly expand from a 60 liter to an 80-liter capacity on extended backpacking trips.


  • Expandable volume for unparalleled versatility: The pack's unique flex gusset offers horizontal expansion to properly carry and secure whatever load you're carrying. It doesn't just compress the pack; it tailors the pack to perfectly suit your needs.
  • Y-Flex aluminum stay is an ideal balance of weight and strength: A central aluminum hub and three separate angled stays allow the suspension system to offer stabilizing support while keeping weight to a minimum and providing flexibility to promote mobility.
  • Adjustable torso to ensure a proper fit: Built-in, easy-to-use adjustability in the shoulder straps enables the pack to be customized to fit torso lengths ranging from 18"-21".

Check out all of these other special features!
  • U-shaped zippered top access to the main compartment
  • Two up-front pockets on the shoulder straps
  • Two stretch mesh side pockets
  • Integrated removable hydration sleeve doubles as a streamlined summit sack (hydration system not included)
  • Zippered hipbelt pockets

California residents: view proposition 65  Warning

Technical Specs

Best Use
Backpacking, Hiking
Top loading
Detachable Daypack
Item Dimensions
13" x 26"
Fits Torso
18" - 21"
Fits Waist
28" - 52"
Frame Material
Aluminum Y Frame
Hydration Compatible
Sternum Strap
Yes; adjustable
Torso Adjustment
2441 cu in - 4882 cu in
Limited Lifetime
Internal Frame Backpack
100D Nylon Honeycomb, 420D Oxford
Item Weight
3 lbs 2 oz

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