All adjustments and tightening straps are on top of the backpack.
The strap in front should be tight, to avoid movement in the backpack.
The strap in the back should be adjusted in a way, that you are able to fit two fingers between the board and your dogs’ chest. This is to make sure that your dogs’ chest can expand when breathing. If you are going downhill for a long time, you can tighten the strap in the back so the backpack will not move forward.