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.

Expandable Volume

The Flex Lumber collection takes our expanding gusset found in our Flex Capacitor, and shifts it vertically to work as a lumbar pack. Flex it open when you need to carry more, or cinch it down when you want a lower profile pack.

Stretch mesh pockets

Keep it hydrated on your hike, bike, or just trip around town with the Flex Lumbar’s dual stretch mesh water bottle pockets.

Zippered valuables pocket

Even when the tail gets a bit bumpy the Flex Lumbar has got you covered. Stash your items with the zipped valuable pockets.

Padded hip belt for on-trail comfort

TheFlex Lumbar’s padded hipbelt makes sure you have on the trail comfort no matter where you adventure.

Expandable Volume

Stretch mesh pockets

Zippered valuables pocket

Padded hip belt for on-trail comfort

Flex Lumbar

The Flex Lumbar collection takes the same expanding gusset found in our Flex Capacitor, and shifts it vertically to work as a lumbar pack. Integrated water bottle pockets and enough room to stash a layer and some food means you have your bases covered for any day hike.

Technical Details

Additional Information