A convertible luggage device that opens to form a mat or work surface that has a raised lip or edge structure that contains items on the mat or work surface. The convertible luggage device closes from the mat configuration to create a sealed bag or sealed flexible container for holding the items inside, where the seal is formed by the lip or edge structure. In some embodiments, the convertible luggage device may include a cinch cord that can be used to change from the open mat configuration into the closed bag configuration. In such embodiments, the cinch cord may include a cord lock that may be adjustably deployed to clamp the cinch cord in a position that maintains the convertible luggage device in a closed bag configuration.