The Sak II is a reversible and removable airbag-backpack designed for Kruyer 2 and for the Karver 2. The Kruyer 2/Karver 2-Sak set brings complete flexibility. If you add a front rescue, all types of flights become possible. It can be attached in 2 minutes by six connections on these harnesses: two points under the thighs, one in the lower lumbar, two at the back and one at the top of the back. The addition of the SaK II improves the comfort and precision of the harnesses. The lateral triangle adds an adjustable lumbar support and a more direct action on the sail when piloting the harness.