WEAR BOTH STRAPS
Use of one strap causes one side of the body to bear the weight of the backpack. By wearing two shoulder straps, the weight of the backpack is better distributed across the shoulders.
WEAR THE BACKPACK OVER THE STRONGEST MID-BACK MUSCLES
Pay close attention to the way the backpack is positioned on the back. It should rest evenly in the middle of the back. Shoulder straps should be adjusted to allow the child to put on and take off the backpack without difficulty and allow free movement of the arms. Straps should not be too loose, and the backpack should not extend below the low back.
LIGHTEN THE LOAD
Keep the load at 10-15% or less of the child's bodyweight. Carry only those items that are required for that day and find a lighter weight backpack if needed. Organize the contents of the backpack by placing the heaviest items closest to the back. Some students have two sets of the same books to avoid carrying heavy books to and from school. A backpack with wheels can also help if the child has to carry greater than 15% of their bodyweight.