Researchers identify the maximum weight that children should carry in their school backpacks, suggesting that school children who use backpacks should avoid loads of more than 10% of their body weight, and those who use trolleys, 20% of their body weight.

Researchers identify the maximum weight that children should carry in their school backpacks, suggesting that school children who use backpacks should avoid loads of more than 10% of their body weight, and those who use trolleys, 20% of their body weight.: https://ift.tt/2KTlKxo Read more... https://ift.tt/2XeUKu4