School starts back in a few weeks, and somewhere in your house there is a backpack that is about to get loaded with five textbooks, a laptop, a water bottle, and a pair of cleats. For most kids that is fine. For some, it is the reason they start complaining about their shoulders in September.
We see the pattern every fall in Alexandria. A kid who was fine all summer starts saying their neck or upper back hurts a few weeks into the school year. Nothing happened — no fall, no collision. The load just went up faster than their body adapted to it.
Here is what actually matters, and what does not.
The Weight Rule People Get Wrong
The common guidance is that a backpack should be **10 to 15 percent of a child's body weight**. For a 90-pound sixth grader, that is 9 to 13 pounds. A laptop, a charger, two hardback textbooks and a full water bottle will clear that on their own.
But weight alone is not the whole story, and this is the part that gets missed: **how the weight is carried matters more than the number on the scale.** A well-fitted 12-pound pack sitting high and tight against the back is easier on a kid than an 8-pound pack hanging off one shoulder down by their hips.
If you only do one thing, do not start by emptying the bag. Start with how it is worn.
The Three Adjustments That Do the Most
**Both straps. Every time.** One-strap carrying forces the spine to side-bend and rotate to counterbalance, and kids hold that position for the entire walk to class, several times a day. This is the single most common thing we see and the easiest to fix — though you may have to fight about it, because two straps is not the look.
**Tighten the straps so the pack sits high.** The bottom of the bag should sit at or above the waist, not sagging onto the lower back. A low-hanging pack pulls the shoulders back and down, and kids compensate by leaning forward from the neck. That forward lean is what produces the upper-back and neck complaints.
**Use the chest and waist straps if the bag has them.** Most kids cut them off or ignore them. They transfer a meaningful share of the load off the shoulders and onto the trunk and hips, which are built to carry it.
Packing It So It Carries Better
Heaviest items go closest to the back, not out in the outer pocket. A textbook riding at the outside of the bag sits farther from the body's center of mass, and the further out the weight sits, the harder the back muscles work to keep the child upright.
Beyond that, it is worth actually opening the bag with them once in August. There is usually something in there that has not been needed since spring.
When a Complaint Is Worth Getting Looked At
Sore shoulders after a heavy day are normal and settle overnight. What is worth a visit:
- Pain that shows up **most days** rather than after unusually heavy days
- Pain that does not settle with a night's rest
- **Numbness or tingling** into the arms or hands
- A change in posture you can see from across the room — one shoulder riding higher, or a persistent forward head
- A kid who has started avoiding activities they liked
That last one matters more than parents expect. Children often do not report pain clearly; they just quietly stop doing the thing that hurts.
The Bigger Picture
Backpacks get blamed for a lot. In fairness, they are rarely the whole cause. A backpack loads a spine that is also spending several hours a day sitting in class, then more hours on a phone or a console. The bag is often the visible part of a broader load problem.
That is good news, because it means the fixes are not complicated: carry it properly, break up long sitting, and pay attention if a complaint starts repeating.
If your child has been mentioning back or neck pain and it is not settling, we are happy to take a look before the school year gets going. An exam takes a few minutes and usually ends with reassurance and a couple of adjustments to how they are carrying things — which is a much better outcome than waiting until October.