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In a recent study, six out of 10 students, ages 9 to 20, reported chronic Back pain related to backpacks, the group said. Occupational therapist Janet O'Flynn said the most common complaints come from backpacks that are too heavy or improperly worn and cause pain or strain to the back and neck. O'Flynn said straps should be worn so that the bag rests 2 inches below the shoulders. Bags should be packed with heavy items closest to the back, so the weight is balanced and doesn't dig into shoulders. And although one-strap messenger bags are in vogue, O'Flynn recommended that students use backpacks that distribute the weight to both shoulders. In a recent study, six out of 10 students, ages 9 to 20, reported chronic back pain related to backpacks, the group said. Occupational therapist Janet O'Flynn said the most common complaints come from backpacks that are too heavy or improperly worn and cause pain or strain to the back and neck. O'Flynn said straps should be worn so that the bag rests 2 inches below the shoulders. Bags should be packed with heavy items closest to the back, so the weight is balanced and doesn't dig into shoulders. And although one-strap messenger bags are in vogue, O'Flynn recommended that students use backpacks that distribute the weight to both shoulders.

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Q: What should never be more than 10 percent of body weight?
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