What's inside students' heavy backpacks?
How backpacks contribute to back pain and what you can do to prevent it - ABC News
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The weight of pupils' schoolbags in early school age and its influence on body posture, BMC Musculoskeletal Disorders
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Children warned about poor posture, heavy backpacks
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70 Percent Of Kids Carry Backpacks Heavy Enough To Potentially Cause Long-Term Back Issues, Study Says - CBS Philadelphia