Usuchaki is a kind of chaki (tea utensil), used to hold powdered tea, and the term is used in contrast to koichaki, which refers to a ceramic chaire specially used to contain the powdered tea for thick tea.
薄茶器（うすちゃき）は茶器の一種で、特に濃茶を入れる陶器製の茶入を濃茶器と呼ぶことに対して、抹茶を入れるのに用いる容器を指す。