Flat briefcases are a type of briefcase that is designed to be slim and lightweight. They are typically made from leather or synthetic materials and feature a flat, rectangular shape with a handle on the top. They are often used by professionals who need to carry documents and other items in a secure and organized manner. ATTACHES are a type of fastener used to secure the contents of a briefcase, such as documents, folders, and other items. Common types of ATTACHES include snaps, buckles, and zippers.