At the end of the Warring States period, the Mohists and Guiguzi gathered all the magical arts from all over the world to build a "mountain and sea bag" that could hold all things. This bag is neither cloth nor leather, but woven from Kunlun silkworm silk. There are three thousand miniature formations engraved between the warps and wefts. It is said that whoever gets this bag can collect all kinds of creatures in the world, sea, land and air, which becomes another strange book after "The Classic of Mountains and Seas".
