I have a 6 racquet Babolat club bag that has a sling strap and no backpack straps.
I walk from my car to the club or the courts with the bag in one hand..it has 4 racquets and everything else I need. During the summer the other hand has an igloo 64 ounce water jug.
If I had 12 racquets maybe I'd need backpack straps.
3.5 player. Equipment: Prince NXG OS, hybrid kevlar mains/poly crosses 50 lbs