These straps come standard on the original Kit Bag and the Snubby Kit Bag - original pattern. On all of the other Kit Bags they are an optional accessory. They don't replace the KB harness, but supplement it. You may want a pair to leave on every pack you carry your KB with.
Using Lifter Straps
Step 1 - Put your pack on over your Kit Bag as you normally would. Install the lifter straps somewhere on your pack's shoulder harness using the black slik clips.
Step 2 - Insert the grimloc into the Lifter Strap
Step 3 - Close the grimloc
Step 4 - Adjust the Lifter straps to your desired height
Step 5 - Loosen the side straps on your Kit Bag