According to The American Academy of Pediatrics (AAP), a backpack “should never weigh more than 10 to 20 percent of your child’s body weight”. Good school backpacks for kids are sturdy, comfortable to carry, have ample space, warranty and affordably priced, because kids will kids, and bags may need to be changed without parents feeling the pinch.

The best school backpacks for second grade and below: L.L.Bean Junior Original Book Pack (Solid Colors) - Tough build quality 
The best school backpacks for third grade and above: L.L.Bean Original Book Pack (Prints) - More space for needs of older students. Also good for second graders.
 

Before you buy a school packpack for your child, remember these guidlines: Capacity. The American Academy of Pediatrics (AAP) says that a backpack “should never weigh more than 10 to 20 percent of your child’s body weight”.  A 15 - 25 liters size school backpack will do.

Good school backpacks for elementary school students is adequately sized young kids, are durable, come with lifetime warranty, and are affordable priced.

The best school backpacks for second grade or below: L.L.Bean Junior Original Book Pack (Solid Colors)  - and - L.L.Bean Junior Original Book Pack (Prints) - Tough build

The best school backpacks for third grade and above: L.L.Bean Original Book Pack (Solid Colors) - L.L.Bean Original Book Pack (Prints) - Tough build, more space