In school many students are carrying too much in their backpacks. Back experts in the USA worry about that young students are having too much in their backpacks.

“It hurts my back when I run,” said Rose,a student in school. “It’s hard to get up the chairs with my backpack because it’s too heavy. ” Students have to carry heavy backpacks on their backs for a whole week. They have regular backpacks with two straps to carry them,but some students with heavy load change to rolling backpacks. The backpacks have wheels and can roll on the ground. Shirley Park’s backpack weighs 10 kilos,and she said,“I’ll change to a rolling backpack because I am starting to have a sore back. ”