Flex Capacitor 40-60L



The lightweight backpack of your dreams is here. Meet the versatile pack that hauls it all. The Sierra Designs Flex Capacitor 40-60L 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.

Small/Medium pack ships with S/M hipbelt

Medium/Large pack ships with M/L hipbelt


Sierra Designs
40-60L / 2441-3661 cu in
S/M: 2 lbs 12 oz / 1.23 kg
M/L: 3 lbs 2 oz / 1.4 kg
Torso Fit:
S/M: 16 - 19 in / 41 - 48 cm
M/L: 18 - 21 in / 46 - 53 cm
Hip Fit:
M/L: 33 - 48 in / 84 - 122 cm
Dimensions (H x W x D):
S/M: 25 x 12.5 x 12.5 in / 63 x 20 x 32 cm
M/L: 27.5 x 8.5 x 12.5 in / 70 x 22 x 32 cm
Lightweight Y-Flex
100D Nylon Honeycomb/420D Nylon Oxford
Other Features:
  • 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 (hydration reservoir sold separately)
  • Dual adjusting shoulder straps tailors the fit to your torso
  • 2 hydration pockets on shoulder straps (flasks sold separately)
  • 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

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