The wedge adjustment system, featured on all our internal-frame packs except the Contour Alpine, is the lightest and easiest-to-adjust harness system available. The system permits rapid adjustment of the harness to fit people of different heights. Pulling up on the wedge releases the slider attached to the shoulder yoke. After moving the slider to its new position, you release the wedge, which locks the slider and shoulder yoke into place. The Wedge Adjustment System is quick, requires no tools, and holds securely, resulting in the most elegant harness adjustment system yet.