Do Backpack Sizes Really Matter for Kids Your Local Chiropractor Says Yes
- Dr. Jason Young
- Aug 5
- 5 min read
That oversized backpack might look harmless when it’s hanging by the front door. But once it’s stuffed with binders, lunch, a water bottle, gym clothes, and whatever mystery items made it home from school, it can become a real strain on a growing body.
Your local chiropractor’s answer is a clear yes: backpack size matters for kids. Not because every sore shoulder is an emergency, but because kids carry these bags almost every school day. Small daily stresses can add up, especially when the backpack is too big, too heavy, or worn the wrong way.
Why the wrong backpack size can cause problems
Kids are still growing. Their bones, joints, muscles, and posture habits are developing year by year. A backpack that hangs too low, pulls backward, or forces them to lean forward can change how they move.
A bag that’s too large often creates three problems:
It encourages overpacking because there’s more room to fill.
It sits too low on the back, which pulls on the shoulders and upper spine.
It shifts around more, so the child uses extra muscle effort to keep it steady.
That doesn’t mean one heavy day will ruin a child’s back. Bodies are resilient. But if a child carries a poor-fitting backpack day after day, the strain can show up as headaches, neck tension, shoulder soreness, mid-back pain, or low-back discomfort.
A common guideline used by pediatric and spine health groups is to keep a loaded backpack around 10 to 15 percent of the child’s body weight. The American Academy of Pediatrics also advises that backpacks should not be too heavy and should be worn with both shoulder straps.
For a child who weighs 65lbs, that means a loaded backpack should ideally be around 6 to 9lbs. That’s not much once you add a laptop or several textbooks.
What a properly sized backpack should look like
A good backpack doesn’t need to be fancy. It just needs to fit the child’s body.
Here’s the quick check:
The top of the backpack should sit around the shoulders.
The bottom should rest near the waist, not down on the hips or bum.
The bag should be no wider than the child’s torso.
Shoulder straps should be padded and adjustable.
The backpack should sit close to the body, not hang far back.
Ideal - a chest strap and or waist strap
If the backpack looks like it belongs to an older sibling, it’s probably too big.
The straps matter too. Thin straps dig into the shoulders. Loose straps let the bag swing and pull backward. One-strap carrying might look casual, but it loads one side of the body more than the other.
A waist strap can help, especially for older students carrying heavier loads. It spreads some weight to the hips and keeps the bag from bouncing around.
Weight matters just as much as size
A backpack can fit well and still be too heavy.
That’s where the daily clean-out helps. Kids are famous for carrying last week’s worksheet, three library books, a half-finished craft, and a rock they found at recess. No judgement. It happens.
Try a quick “Sunday reset” or a two-minute check before school:
Take out old papers.
Remove books that don’t need to travel.
Empty extra toys, rocks, and random objects.
Refill only what’s needed for the next day.
Keep heavier items closest to the back.
That last point is a big one. Heavy items packed far away from the spine pull the body backward. When heavier books or devices sit close to the back panel, the load feels more stable.
Teachers can help too. When possible, giving students a place to keep indoor shoes, extra supplies, or extra books at school can make a noticeable difference. Even small changes help when repeated throughout the week.
Signs a backpack may be causing strain
Kids don’t always say, “My backpack is affecting my posture.” They’re more likely to say their shoulders hurt, they don’t want to carry their bag, or they’re tired.
Watch for these signs:
Red marks on the shoulders after wearing the backpack
Tingling or numbness in the arms or hands
Complaints of neck, upper back, or low-back pain
Leaning forward while walking with the bag
Struggling to put the backpack on or take it off
One shoulder sitting higher than the other
Avoiding the backpack or asking someone else to carry it
If a child has pain that keeps coming back, doesn’t improve with a lighter bag, or affects sleep, sports, or school comfort, it’s time to ask for help.
How to choose a better backpack
When shopping, start with fit before colour or pattern. The fun design matters to kids, of course, but comfort should come first.
Look for:
Two wide padded straps
These spread pressure better than thin straps.
A padded back panel
This helps stop books or binders from poking into the back.
Several compartments
Compartments make it easier to balance the load.
A chest or waist strap
Helps to stabilize the load and can really help active kids or students with longer walks.
Lightweight material
Some backpacks are heavy before anything goes inside. Start light.
The right size for this year
Avoid buying a huge backpack for a child to “grow into.” Oversized bags often sit poorly and invite overpacking.
For younger kids, smaller is usually better. They don’t need a hiking pack for a folder, lunch bag, and snow pants. For older students, the goal is still the same: keep the bag close, balanced, and reasonable.
A simple backpack fit test at home
This takes less than five minutes.
Pack the bag the way it’s usually packed for school.
Have the child put it on using both straps.
Tighten the straps so the bag sits high and close.
Check that the bottom sits near the waist.
Ask the child to walk across the room.
Now watch.
Do they lean forward? Do they shrug their shoulders? Does the bag swing side to side? Do they complain right away?
If yes, try lightening the load, adjusting the straps, or switching to a smaller backpack. Sometimes the fix is simple.
When a chiropractor can help
A chiropractor can look at how a child stands, walks, moves, and carries their backpack. They can also check whether pain is coming from muscle strain, joint irritation, posture habits, or something that needs a different type of care.
In Kingston, school routines can mean long walks to class, icy sidewalks in winter, heavy outdoor gear, and busy after-school schedules. A backpack is only one piece of the picture, but it’s an easy one to improve.
If there’s regular discomfort, a backpack fit check and movement assessment can be a useful starting point. You can book a new patient visit with Forever Young Chiropractic if you’d like support figuring out what’s going on.
The takeaway is simple: the best backpack is the one that fits the child in front of you. Keep it light, keep it close, use both straps, and don’t let extra space turn into extra weight. A few small adjustments now can make school days a lot more comfortable.
Give us a call at ForeverYoung Chiropractic, we have two locations to serve you better: Kingston 613-507-5007 and Shannonville 613-966-5855. Or online at https://www.foreveryoungchiro.ca/patientintakeprocess.
