Born in California and bred on the trail, Sierra Designs has created outdoor equipment and apparel driven by function & designed to keep you happy since 1965. We believe outdoor adventures should be within reach for everyone. That means planning your days around the pull of exploration. It means celebrating your moments listening to campfire crackles and staring at limitless sky. It means getting a little beyond your comfort zone and never settling for ordinary. We create innovative, attainable, functional gear that we stand behind to allow you to Think Outside - because life is found in the adventure, not in the destination.
Made for the long or short haul. The horizontally expanding gusset changes the volume of the pack, to perfectly fit any load the pack can carry. Rather than just compress the pack, you’re able to tailor the pack to fit your needs. With three sizes in a 25-40, 40-60, and 60-75 L capacity, there is a flex pack to fit your needs.
A central aluminum hub and 3 separate stays allow our Y-Flex DAC suspension to comfortably carry any load. The Y-Flex adds lightweight support to the Flex Capacitor, and lets the lightweight bag hit above its weight class with comfortable carry.
Bring it all. A bucket lid with a stash pocket closes everything up, while dual stretch side pockets cover shove it needs. Shoulder strap water bottle pockets also carry a GPS or phone for quick access, and hip belt pockets keep items secure and easy to reach.
The Flex Capacitor is a backpack with a rigid, but lightweight frame that is capable of handling heavy loads of 50 pounds or more. That alone makes it a unique offering among lightweight backpacks weighing 3 pounds or less. Making it perfect for long treks or day trips around town.
Adjustable Volume
Flex Suspension
Extra Storage
Ultra-Lightweight
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 60-70 L capacity, there is a flex pack to fit your needs.
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