Do painting and calligraphy entries have to use painting tubes?

Not necessarily. The works in calligraphy and painting are more convenient to carry and can better protect the works from wrinkling. But there is no requirement that the work must be used, and you can do it according to your actual situation. Calligraphy and painting is the general name of ancient calligraphy and painting in China, one of the traditional art categories of the Chinese nation and an important part of Chinese civilization.