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UOG TOP PICK - Sierra Designs Flex Capacitor - one of the most versatile packs with a capacity that can be adjusted from 40 to 60L. Some great design features round off a fantastic pack.
The Flex Capacitor is a modern classic, renowned for its light weight, class-leading versatility, and innovative features. This is the 40-60L version, the perfect workhorse for everyone from the weekend warrior to the veteran thru-hiker.
Sierra Designs says
Meet the pack that does it all. The Flex Capacitor family of packs feature adjustable volume to handle both short and long hauls, and a Y flex suspension system that carries above their weight class. With three sizes in a 25-40, 40-60, and 60-75 L capacity, there is a flex pack to fit your needs. A bucket lid with a stash pocket closes everything up, while dual stretch pockets on the shoulder straps and side of pack cover shove it needs.
Our Verdict
Sierra Design's Flex Capacitor 40-60L Rucksack is the ultimate in versatile, adaptable load-carrying, and the flexibility offered by the expandable volume make this the one-pack solution for any adventure. Built around a Y-Flex suspension system, the Flex Capacitor is surprisingly burly for its low weight, with a well padded lumbar and a wide hip belt to better handle heavier loads. The pack itself is constructed primarily from 100D fabric, guaranteeing durability and water-resistance while keeping the weight to a minimum. 400D Nylon has been used in the base of the pack, to better protect against rocky campgrounds and long-term use.
The expandable volume of the Flex Capacitor is its greatest strength. Where most expandable packs do so with a longer body, the Flex expands its circumference instead, making it a far more comfortable pack when fully opened. This also provides a far greater range than most of its competitors – while many similar packs only manage 10L of expansion, the 20L offered by the Flex Capacitor make it a pack that can happily accommodate everything from long weekends to weeks on the trail.
The U-shaped lid access to the pack body is a beautifully simple solution to the heavy lids featured on many similar packs, and makes for a rucksack that is refreshingly easy to pack and surprisingly spacious. The Flex Capacitor veritably swallows gear, while still providing dedicated space for a hydration bladder and keeping a small zipped essentials pocket in the roof, ideal for navigation kit and snacks. The finishing touches are all present too – there are two ice axe loops, a pair of roomy hip belt pockets, and four stretchy mesh pockets; two on the sides of the pack body complemented by one on each shoulder strap. All-in-all, the Flex Capacitor 40-60L is the ideal solution to the age-old question of pack size, capable of withstanding the harshest conditions and comfortable under the heaviest loads.
- Reviewed by Ultralight Outdoor Gear
Features
- Expandable Volume
- 2 stretch mesh side pockets
- 2 stretch mesh hydration pockets on shoulders
- Zippered hip belt pockets
- U-shaped top access zipper
- Small stash pocket in lid
- Ultralight weight
- Lightweight 'Y' Flex DAC suspension
Specifications
Small/Medium Torso
- Capacity: 39-56L
- Weight with S/M waist belt: 1168g
- Weight with M/L waist belt: 1208g
- Torso Fit: 16" - 19" / 40.6 - 48.3 cm
- Hip Fit with S/M waist belt: 26" - 38" / 66 - 97 cm
- Hip Fit with M/L waist belt: 33" - 48" / 84 - 122 cm
- Dimensions (H x W x D): 27.5" x 11" x 10" / 70 x 28 x 25.4 cm
- Suspension: Y Flex DAC
Medium/Large Torso
- Capacity: 42-60L
- Weight with S/M waist belt: 1186g
- Weight with M/L waist belt: 1214g
- Torso Fit: 18" - 21" / 45.7 - 53.3 cm
- Hip Fit with S/M waist belt: 26" - 38" / 66 - 97 cm
- Hip Fit with M/L waist belt: 33" - 48" / 84 - 122 cm
- Dimensions (H x W x D): 27.5" x 11" x 10" / 70 x 28 x 25.4 cm
- Suspension: Y Flex DAC
Materials
- 100D Nylon-Poly Ripstop/420D Nylon Oxford
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