Abstract: A container includes a main body having a receiving space and an opening; and a cover covering the opening of the main body. The main body has a rib divided and a groove portion between the parts of the rib, the cover has at least two track-shaped coupling grooves into which a rib of a main body of another container of same shape is inserted and which are spaced apart from each other, and has a track-shaped airtight groove in an edge portion of an opposite surface of the cover to allow the coupling grooves to be put therein. An edge of the opening of the main body is inserted into the airtight groove, and a spaced portion between two track-shaped coupling grooves of a cover of another container is inserted into the groove portion of the rib of the main body.