Heavy Backpacks

In my last post, I talked about the heavy backpacks that we have to carry around in the school. Here is a research at University of California in Riverside that shows how serious this problem is:
"Shouldering a hefty load can cause back pain, according to a study by researchers at the University of California in Riverside.
The study was led by David Siambanes, DO, of the Inland Empire Spine Center in Riverside, Calif. Participants were 3,500 students aged 11 to 15 at four middle schools in Riverside and San Bernardino counties.
Researchers weighed the children's backpacks and asked the kids how often they used their backpacks and how much pain, if any, they felt as a result.
Most students said they hurt, at least a bit, from their backpacks; 64% reported having back pain at some time. Two of every five children said they felt pain while wearing their backpacks. In students reporting pain, about 12% said it was "not bad," while almost 90% said their back pain was "bad" or "very bad."
Of those reporting back pain, 21% said their pain lasted more than six months. About 16% said they had missed school, gym class, or after-school sports because of the pain, and almost 17% said they had seen a doctor for their back pain. Most students with back pain said the pain was recurrent."
Source: http://www.webmd.com/back-pain/news/20040813/heavy-backpacks-can-hurt-student-backs
This research shows that students face a lot of physical problems caused by the weight of their backpacks. We might not understand the importance of the situation and say that the bags are "not that heavy"; however they cause us a lot of pain eventually.
This problem started as the amount of books that the students have to carry increased enormously. We have at least a notebook, a folder and a very thick book for every class. As we carry the materials of more than one lesson in our bags because there is no time to go to our lockers, our backpacks become very heavy. We have to understand that this is a serious situation and we have to carry less weight in our backpacks for our own health even if it means that we will be late for a class...