Catalog cases are a type of portable file folder, typically used by businesspeople, lawyers and salespeople, who need to transport considerable amounts of information for meetings, court sessions and presentations. Wider than a conventional briefcase, it can hold multiple files, product samples and a laptop computer. Although many models open from the top via a large flap, some styles may also have front pockets or zip-down organizer panels for supplies like pens, business cards or a calculator. The large interior compartment may have file dividers or several individual sections. Exterior side pockets provide easy access to frequently used items like a cell phone, keys or sunglasses. Catalog cases with wheels and a retractable handle make getting around easy. In addition, many models also provide a removable, padded shoulder strap and ergonomic hand grips for lifting the bag over uneven surfaces or carrying it up a flight of stairs. Fabrics like leather, canvas, nylon or vinyl are both durable and easy to maintain.