The right and wrong way to wear your backpack

Before sending the kids off to school, double check that they aren't putting their bodies at risk with their backpacks.

It's their helper during the school day and even comes home with them at night, but your student's backpack could be a hidden danger if not used correctly.

Doctors say bookbags that are too big or too heavy could have lifelong consequences causing severe strain on the neck, shoulders and back.

So, how heavy is too heavy? Health experts say backpacks should be no more than 15% of your child's weight.

This means, an 80-pound student should be carrying a bookbag that's no more than 12 pounds.

We pulled out a scale to show you just quickly this weight can add up. We found just three, average-sized books and a laptop weighed nine pounds. Plus, this doesn't include what else your student could be packing, like an instrument or full bottle of water.

There are a few things to do to tackle these concerns. When packing your backpack, start with the heaviest items first like an instrument or heavy book. Also, don't miss the signs of trouble. If you notice your child straining to pick up the backpack, or if your child is leaning forward while carrying the bag, it's probably too heavy.

If it's hanging below their lower back as they wear it, it's probably too big or the straps need to be adjusted.

This is not a one-size-fits-all-type purchase.

ABC News Medical Contributor Dr. Alok Patel said, "Make sure your child is practicing good form with that backpack. Make sure it's snug, it's against their back, and they're using both straps. And for any parents who may have a child with an underlying condition, like a musculoskeletal condition, there are different types of backpacks, even wheelie-rollie backpacks, that might be a better and safer option."

Keep in mind, using only one strap distributes all the weight to one side and can cause spinal twisting and uneven muscle use. Wearing your backpack the right way means using both straps with no gap between the bag and the back but not too tight.

Lastly, parents should not ignore complaints about aches and pains from students. Pay attention. If your child looks uncomfortable carrying the backpack, it might be time for a change.