School backpacks are a staple, holding all the essentials kids need to make it through the day. But when the backpack starts to weigh your child down, could it be causing long-term damage? Dr. Dan Brennan shares his tips on how to safely lighten the load for the school year! #webmd #backpack #backpacks #backpackchallenge #backpackingtips #school #schoollife #schoolsupplies #backto #backtoschoolshopping #backtoschooloutfit #backtoschoolcheck #backtoschoolhaul #schoolsa #schoolsafety #schoolsafetymatters #schoolsafetyfirst