SKU: 31691839708

Sierra Designs Flex Capacitor 40L-60L Backpack Bag - Butterscotch

Sale price$429.75 Regular price$477.50
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Ships within 48 hours · Estimated delivery Jul 11 - Jul 16

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Description

Sierra Designs Flex Capacitor 40L-60L Backpack Bag - ButterscotchThe Sierra Designs Flex Capacitor 40L 60L Backpack Bag Butterscotch Unleash your wanderlust with The Flex Capacitor 40 60. This lightweight backpack is your ticket to extended adventures and versatile gear hauling. Crafted from durable nylon, this backpack is a reliable companion in the rough terrains of the backwoods. The innovative design features expanding horizontal gussets that offer an adjustable 15 20L extra cargo capacity for longer

The Sierra Designs Flex Capacitor 40L-60L Backpack Bag - Butterscotch

Unleash your wanderlust with The Flex Capacitor 40-60. This lightweight backpack is your ticket to extended adventures and versatile gear hauling. Crafted from durable nylon, this backpack is a reliable companion in the rough terrains of the backwoods. The innovative design features expanding horizontal gussets that offer an adjustable 15-20L extra cargo capacity for longer backpacking journeys, while also allowing for a compact, snug fit for quick summit dashes. Quick-stash solutions abound, with convenient storage options on the straps, sides, and bucket lid to keep your trail essentials within easy reach. The Y-Flex suspension system provides exceptional support, ensuring this lightweight backpack can punch above its weight class.

Specifications:

  • Material: 100D Nylon Honeycomb/420D Oxford
  • S/M Torso Capacity: 40-60L
  • Weight: 1.23 kg
  • Torso Fit: 41 - 48 cm
  • Hip Fit with S/M waist belt: 71-117 cm
  • Dimensions (H x W x D): 63 x 20 x 32 cm
  • Suspension: Lightweight Y-Flex
  • M/L Torso Capacity: 40-60L
  • Weight: 1.4 kg
  • Torso Fit: 46 - 53 cm
  • Hip Fit with M/L waist belt: 84-127 cm
  • Dimensions (H x W x D): 70 x 22 x 32 cm
  • Suspension: Lightweight Y-Flex

Prepare for your next adventure with The Flex Capacitor 40-60. Whether you're embarking on a challenging backpacking expedition or a quick day trip, this backpack offers the flexibility and durability to meet your needs. Order now and experience the freedom of versatile gear hauling with Sierra Designs.

Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 31691839708

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Nick
Lake Worth, US
★★★★★ 5
Great quality and fast shipping
Size: Medium, Color: (001) Black / Black / Castlerock
These socks are tight but after the first wash and dry , they fit perfect and NEVER slide off , ordered a second pack
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Reviewed in the United States on March 24, 2026
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Bargain Rig
Carnegie, US
★★★★★ 5
Comfortable, Durable, and Stylish
Perfect gift choice! Excellent quality socks with a variety of colors to match any wardrobe.
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Reviewed in the United States on November 30, 2025
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Aaron Braumann
Waukegan, US
★★★★★ 5
Finally found a good set again.
Size: X-Large, Color: (001) Black / Black / Castlerock
I’m picky on socks, any they always have to be Under Amour. These are top notch, super padded but also temperature regulating, feet don’t sweat when wearing, and I can tell in the winter they’ll stay the right temperature. They also fit great. Purchasing more.
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Reviewed in the United States on May 6, 2026
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Ash
Los Angeles, US
★★★★★ 5
Best Quality Socks & Great Thickness Plus Comfort
Size: Medium, Color: (001) Black / Black / Castlerock
I love these. They do not slip away from foot. The value for a good pack of socks was worth it. Has a good thick quality. They look clean and nice. Their stretch is good to get on and then molds to foot. Have noticed these socks have changed two times since buying. First they were slightly lighter color gray- then a darker gray but both had good quality and thickness. I am sure these are very durable but unfortunately I can not speak fully to this as the horrible steel toe shoes I have to wear rip everything apart. But if I had good shoes and everyday use of these I know they would stay good for so much longer than 6months.
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Reviewed in the United States on July 7, 2025
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Benjamin Butler
Omaha, US
★★★★★ 5
Best socks ever
Size: Large, Color: (100) White / White / Mod Gray
Best athletic socks I’ve bought. I usually buy UA socks anyway and these are the best. Super soft and comfy. Fit snug and my feet don’t slide around in them.
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Reviewed in the United States on February 9, 2026

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