What are the disadvantages of carrying a heavy bag?
In addition to the negative effects on posture, carrying around heavy backpacks for a long period of time could also cause a certain degree of scoliosis, kyphosis or other spinal malformations, even though it is not permanent.
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By putting a heavy weight on your shoulders in the wrong way, the weight's force can pull you backward. So people who carry heavy backpacks sometimes lean forward. Because of the heavy weight and this unnatural position, they can develop shoulder, neck, and back pain.
Some studies recommend only carrying a load of 30% of your bodyweight. Others, however, have reported participants experience discomfort carrying 20% of their bodyweight when exercising for more than an hour. To avoid this when starting out, carry a backpack that's as light as 5-10% bodyweight.
It can cause poor posture, compressed discs in the spine, and even curvature of the spine. Straps digging into the muscles of the shoulder were also found not just to irritate the area, but to cause potential damage to the nerves of the hands and arms. These issues aren't just small problems.
Pain caused from excessive loads has gained the term “backpack syndrome.” Backpack syndrome causes headaches, neck and back pain, and fatigue. There have been studies examining the effects of carrying backpacks on one shoulder versus both shoulders. Carrying a bag on one shoulder causes significant asymmetries.
Straps being pulled down by a heavy bag can put quite a lot of pressure on your muscles, which can pinch your nerves and cause that numb/tingling sensation. Over time, this can cause nerve damage, which can take a long time to heal, and will only get worse if you continue to lug around the heavy bag.
Heavy Bags Affect Your Natural GaitUneven weight distribution forces you to alter your gait and swing one arm more than the other. This adjustment affects your neck and shoulders by increasing the exertion of one side while leaving the other dormant.