Last updated: July 2026 • Reading time: ~4 minutes
Every August, families across Connecticut start hunting for a new backpack before the first day of school. It seems like a small purchase. But new research shows a heavy backpack can strain a child’s spine much like a loaded suitcase strains an adult’s shoulder, except kids carry that load on a back that is still growing. Laptops, binders, water bottles, and lunch boxes add up fast. A 2025 study of 384 primary school children found that more than half already had back pain, and researchers linked much of it to how the students carried their bags. Here is what the science says, and what parents can actually do before the bus arrives.
How much should a backpack weigh?
Most pediatric health groups recommend a backpack weigh no more than 10 percent of a child’s body weight. A 60-pound child should carry about 6 pounds. In real life, kids carry far more. A 2024 study in the Journal of the Canadian Chiropractic Association found students aged 11 to 18 carried an average of 15.9 percent of their body weight, and more than half of them reported physical complaints like back, shoulder, and neck pain. Think of it like carrying a bowling ball where a bowling shoe would do.
What are the warning signs a backpack is hurting your child?
Watch for red marks or grooves on the shoulders, tingling in the arms, or a child who leans forward to balance the load. Some kids complain of headaches or a sore neck by the end of the school day. A 2024 study in BMC Musculoskeletal Disorders found these symptoms were common in students who regularly carried heavy backpacks, especially when the bag was worn low or slung over one shoulder. Slouching to compensate for weight is often the first sign something is off, long before a child says anything hurts.
How should a backpack be worn to protect the spine?
Both straps matter. Wearing a backpack on one shoulder twists the spine to offset the weight, which can strain muscles unevenly on one side. The bag should rest at hip level, not sag toward the lower back, and heavier items belong closest to the body. A padded waist strap, if the backpack has one, moves some of the load from the shoulders to the hips, which are much better built to handle weight.
What can parents do to prevent backpack back pain?
Start by weighing the packed bag on a bathroom scale. If it is more than 10 to 15 percent of your child’s weight, it is time to lighten the load. Ask the school about digital textbooks, locker access between classes, or leaving heavier books at home when possible. A 2024 study in Scientific Reports involving Thai primary school students found that reducing backpack loads and improving carrying habits measurably lowered reports of musculoskeletal discomfort.
The bottom line
A backpack is not just a bag. For a growing spine, it is a daily load-bearing exercise, for better or worse. Simple changes like weighing the pack, using both straps, and clearing out unnecessary items can make a real difference before problems set in. If a child’s back pain does not improve with these changes, options range from physical therapy and stretching routines to a checkup with a chiropractor, who can assess posture and spinal alignment as one part of a broader plan. For related reading on how posture habits affect the spine over time, see our articles on tech neck and forward head posture, why mornings are often the worst time for back pain, and what actually happens inside a herniated disc.
Sources
- Khalafalla, S.G.A., et al. “Exploring the relationship between schoolbag weight and back pain in primary school children.” Journal of Orthopaedic Surgery and Research, 2025. 384 students studied; 52.1 percent reported back pain.
- Journal of the Canadian Chiropractic Association, 2024. 300 students aged 11-18 carried an average of 15.9 percent of body weight in backpacks; 54 percent reported physiological complaints.
- “Musculoskeletal symptomatology in skeletally immature students carrying heavy backpacks: a cross-sectional study.” BMC Musculoskeletal Disorders, 2024. Found strong links between heavy, improperly worn backpacks and reported shoulder, neck, and back symptoms.
- “Exploring musculoskeletal discomfort and school bag loads among Thai primary school students.” Scientific Reports, 2024. Reducing backpack load and improving carrying habits was associated with fewer reports of musculoskeletal discomfort.
