A briefcase is a portable container used for carrying papers, books, and other documents, as well as other small items such as laptop computers, tablets, and mobile phones. Briefcases are often used by office workers, lawyers, and students, and are typically made of leather or other durable materials such as nylon or ballistic nylon. They are commonly found in black, brown, and grey, but may also be available in other colors. Briefcases generally have one or two handles, and may be secured with a lock or combination lock. They may also have additional pockets and compartments for organizing items.