Ideally, your backpack should be worn using both straps, so it evenly distributes the weight contained in the pack. Then the pack should sit around 2 inches from your shoulders and is an inch above your hips. It is better to have your pack higher on your body rather than lower, otherwise, you could start to face back problems or feel unstable. It is important to ensure that your straps are secured properly when you put the pack on. You can always loosen the straps when you take the pack off at the end of your ride.