Sierra Designs

Lightweight lumbar pack with adjustable volume

The Sierra Designs Flex Lumbar collection takes the same expanding gusset found in the popular 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. Flex it open when you need to carry more, or cinch it down when you want a lower-profile pack.