When purchasing kids backpacks make sure the size is the correct, you don’t want a child to carry a huge backpacks, same as a taller bigger kid carrying a tiny backpack. Buy 13″ backpacks for the little ones in Kinder and Pre-School, 15″ backpacks should be enough for Middle School kids. There is a wide wide variety of 13″ to 15″ backpacks sold online in many sites at bulk discount prices.