What is the name of the bag used to hold things in Xian Xia's novels?

Storage bag, dry bag. . . Gankun bag: owned by Maitreya, also known as "Ruyi Gankun bag" and "Jinkun bag", it is specially used for storing things. With incredible power, there is a strange space inside, and the space is so big that it seems to accommodate heaven and earth. There is also a Gankun in the bag, called "Bao Zhongtian", which has everything and is inexhaustible. (from encyclopedia)