With the schools back, its time for the backpack that your child is wearing is checked for weight.
Researchers say that if your child has trouble putting on his or her back pack, if his or her posture changes or any mark is left from the back pack then it is definitely too heavy.
The back pack should weigh no more than 10-15% of the child’s weight, but less is always better. This is about 7lbs for a child who weights 50 pounds. For example, a back pack of a child who weighs 80 pounds shouldn’t weigh more than 8 -12 pounds. Also make sure they use both shoulder straps, as bags slung over one shoulder are bad, it should rest evenly in the middle of the back and not sag down to the buttocks.