Depending on the straps you get, you may need to unfasten the shoulder straps on your backpack (I did for my Daysack strap). If you've already got them at the perfect length, I recommend putting a ...

The last two adjustments you’ll make on your pack are the load lifters and the sternum strap. Adjust your load lifters first by pulling down on the tab until the straps make a 45-degree angle.