Keep in mind that bigger is not necessarily better. Parents should buy the best-designed backpack possible for their child. The more room there is in a backpack, the more your child will carry-and the heavier the backpack will be. It is important that your child wear both shoulder straps. Lugging the backpack around by one shoulder strap can cause the disproportionate shift of weight to one side, leading to neck and muscle spasms, as well as low-back pain.
Padded straps are very important.
Non-padded straps are uncomfortable, and can dig into your child's shoulders. The shoulder straps should also be adjustable so the backpack can be fitted to your child's body. Shoulder straps that are too loose can cause the backpack to dangle uncomfortably and cause spinal misalignment and pain. If the backpack is still too heavy, talk to your child's teacher. If your child continues to complain about back pain, consider an alternative to traditional backpacks-packs on wheels.