School bags are an essential item for students, providing a means of carrying books, papers, and other necessary supplies. There are several synonyms that can be used for school bags, including backpacks, bookbags, knapsacks, rucksacks, and satchels. Backpacks are the most common type of school bag, often with two straps and multiple pockets. Bookbags and knapsacks are similar to backpacks but may have only one strap or be made from a different material. A rucksack is a larger type of backpack that may have a frame for support. Satchels are typically smaller and carried over one shoulder, often used by younger students. Whatever the style, school bags are an important part of a student's daily routine.