Most racket bags offer a choice of carry options. You can use a single large strap to carry it over your shoulder (as you see the pros do when they walk onto court) or often there are double backpack style straps that enable you to spread the weight better. If you’re walking longer distances it’s likely you’ll favour that option with the racket heads facing downwards to the small of your back. If you’re wearing over the shoulder, again it’s most common for the head end to be at the back.