Backpacks are essential for students to carry books. It is important to know how to properly wear a backpack and for it not to be too heavy. If a backpack is too heavy or worn improperly, it can cause back, shoulder and neck pain. According to OrthoInfo, heavy backpacks can also cause problems in your posture.
Choosing an appropriate backpack is important. Make sure the backpack has a padded back, waist strap, padded shoulder straps and is lightweight. You can help prevent backpack injuries by tightening the straps, using both shoulder straps and packing light.
(Photo from http://orthoinfo.aaos.org/topic.cfm?topic=A00043)