A briefcase is a thin hard-sided box-shaped bag or case with a handle that is mostly used for holding papers. Briefcases are widely used by lawyers to transport briefs to deliver in court, thus the name. The briefcase still serves the functional purpose that Roman troops preferred: it transports modern-day weapons like your laptop, phone, and reusable coffee cup. The traditional design of the leather briefcase may also add beauty and sophistication to any professional outfit.