Sierra Designs Flex Capacitor 40-60

Lightweight hiking backpack with expandable volume and lightweight design.

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The opinion of Aventure Nordique

The Sierra Designs Flex Capacitor 40-60 is a lightweight, functional and well designed backpack. It is a versatile carrying solution for hikers who want a backpack for multiple uses: hiking, trekking, mountain....

This backpack has an aluminium frame for better carrying comfort. It has a padded back at the points of contact with the body, padded shoulder straps and a wide hip belt. It combines lightness and comfort.

The Flex Capacitor 40-60 features a clever design that allows the volume to be varied from 40 to 60 litres and still fit snugly. The compartment is accessed from the top via a U-shaped closure. Compression straps allow for additional storage capacity. This feature offers great versatility to the Flex Capacitor 40-60.


The bag opens at a zippered top flap featuring a zippered pocket for storing small items.

The hip belt has large pockets for a phone, keys or a few cereal bars.

On the sides, two soft pockets offer additional storage space.

On the inside, it is possible to slip your own hydration system into a removable pocket (there is a feed tube passage). The pocket can be worn alone on the back when you need a very small capacity.

On the shoulder straps there is a soft pocket for a bottle/water bottle, giving you direct access to your drink.

Technical details

Manufacturer Sierra Designs
Product name Flex Capacitor 40-60
Volume 60 l
Model Unisex
  • Fabric : 100D Nylon-Poly Ripstop/420D Nylon Oxford
  • Reinforcement : Y Flex DAC
  • Straps and belt : Mousse EVA
Accessories Hydration compatible, Carrying handle, Compression straps
Dimensions S/M : 63 x 20 x 32 cm - M/L : 70 x 20 x 32 cm
Weight S/M : 1230 g - M/L : 1400 g
Additional information

    Choice of size

    S/M :

    • Back length: 41 - 48 cm
    • Waist size: 71 - 117 cm


    • Back length: 46 - 53 cm
    • Waist size: 84 - 122 cm
      Warranty 2 years
      Country of Manufacture Philippines


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