A typical school backpack usually consists of several parts that all work together to make it comfortable and functional. The first part is the straps or harness system that help evenly distribute the weight of books and supplies on the back and shoulders. The straps should be adjustable so they can fit different body types, making it easier for students to carry their backpacks comfortably throughout the day. The second part is a padded back panel that provides extra cushioning for comfort while carrying heavier loads over long periods of time. The third part is an internal frame sheet located inside the backpack which gives additional structure and support when carrying heavy items like textbooks or laptops.