Flex Capacitor 60-80L



The lightweight backpack of your dreams is here. Meet the versatile pack that hauls it all. The Sierra Designs Flex Capacitor 60-80L is a beast of a 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 pack can punch well above its weight class.


Sierra Designs
60-80L / 3661-4882 cu in
3 lbs 2 oz / 1.40 kg
Torso Fit:
18 - 21 in / 46 - 53 cm
Hip Fit:
33 - 48 in / 84 - 122 cm
Dimensions (H x W x D):
27.5 x 8.5 x 12 in / 70 x 22 x 30.5 cm
Lightweight Y-Flex
100D Nylon Honeycomb/420D Nylon Oxford
Other Features:
  • Expandable volume: 60L - 80L
  • Lightweight 'Y' Flex suspension
  • 20L adjustable volume to tailor both to extended backpacking trips or shorter day trips.
  • 2 Stretch mesh side pockets
  • 2 Stretch hydration pockets on shoulder straps (flasks sold separately)
  • 2 large zippered pockets on waist belt
  • U-shaped top zippered access
  • Zip stash pocket in lid

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