BROOKLYN - While parents are hustling for back-to-school supplies, doctors say they should be wary of what backpack they buy for their children.

Dr. Mara Karamitopoulos, a pediatric orthopedic specialist at Maimonides Medical Center, says the wrong backpack can lead to lower back problems that could need treatment.

The doctor says backpacks should be sturdy with wide straps with a weight less than 20 percent of a child’s body weight.

Supplies and books should also be evenly distributed inside the bag to avoid future back troubles.