"UB 1" in CK package refers to the model or series name of a package of CalvinKlein brand. "UB 1" in CK package refers to the model or series name of a package of CalvinKlein brand. CalvinKlein is a well-known fashion brand, famous for its simple and fashionable design style, and its products cover many fields such as clothing, shoes and accessories. As a series under CalvinKlein brand, CK bag also inherits the brand's simple and fashionable design concept and is a classic in fashion. UB 1, as a model or series name of CK bag, also represents a simple and fashionable design style, and is one of the trend items pursued by fashionistas.