A bag or strap for your books is convenient. If you keep your belongings together, you are less likely to lose or mislay your books and papers, and you are more likely to be really prepared with everything your need for your work.
– Faculty of the South Philadelphia High School for Girls, comp. Everyday Manners for American Boys and Girls. New York: Macmillan, 1922. Print.
Having everything that you need for your work is courteous whether you are a student or employee. It sends the message that you believe the teacher or your bosses time is important.