Book bags are flexible, lightweight bags designed for carrying books or other educational materials to and from school. Book bags come in many different styles, sizes and colors, nevertheless the most commonly used design are backpacks which features a sack with side pockets, padded shoulder straps as well as additional reinforcement to hold textbooks.
Luggage is any number of bags, cases and containers which hold a traveller's articles during transit. Types of luggage include suitcases, duffel bags, and tote bags. Today many types of luggage have wheels as an added convenience.