Although it is more convenient to do so, it is likely to cause back muscle damage, and eventually it will let you quit the sport you love early.
It's not that you can't use a shoulder strap to back the bag, but that the muscles that bear the weight of the bag have more important tasks to accomplish: swing. Dr. Robert Watkins, a medical consultant and spine surgeon for the PGA Tour, told us: “Swings make the waist muscles a sensitive area, which can easily cause sports injuries, so pay special attention to protection.”
“For right-handed players, the power required for the swing comes mainly from the right half of the body,” says Ben Diar, a fitness consultant at Golf Digest. “One day, you will find that the muscles of the body are not balanced. Therefore, Frequent use of a shoulder-slanted cross-ball bag will make this situation worse."
“One way to avoid imbalances in muscles on both sides of the body is to use two shoulders to take turns backpacking,” Dr. Watkins suggested. However, Ben Shear suggested that we use the “farmer's method”: share the weight of the bag with two arms like a sack. It should be noted that the body should be kept straight when carrying the bag, and you should not bend over and hunch, but also pay attention to protect your shoulders. Dr. Watkins also suggested that even if you use the shoulder straps on both sides, you should raise your chest. The more the body bends, the greater the pressure on the spine above the chest, which can easily cause cervical spine damage.