Expansion box is a new type of item that looks like both a box and a handbag, not only exuding a fashionable atmosphere in appearance, but also providing convenience for daily life. It is made of environmentally friendly materials, lightweight and sturdy, suitable for carrying. The internal design of the expansion box is reasonable and can meet different needs, such as storing files, books, laptops, etc., making daily work easier. At the same time, it can also be used as a travel suitcase, with a high pull rod design for easy walking, and multiple functions such as waterproofing and scratch resistance to protect property safety. There are also various styles of expansion boxes with unique features to choose from, meeting the aesthetic needs of different groups of people.