a portable rectangular container for carrying clothes
"he carried his small bag onto the plane with him"
A large (usually rectangular) piece of luggage used for carrying clothes, and sometimes suits, when travelling.
"After packing all my clothes into the suitcase, I wheeled it to the taxi stand ready for my trip home."
To trade using samples in a suitcase.
"Please note that we are not allowed to trade using samples in a suitcase at our booth today."