To make waste treatment including recycling easy by making it possible to break apart and stack empty containers and thereby reducing volume of the containers.

The bottle 1 is composed of a belt shaped part 2 in its center, an upper part and a lower part 3, 4 of which shape are trapezoidal cones. The bottle is designed to be separated at the belt shaped part. When plural bottles are separated, their upper parts and lower parts can be stuck, and a total volume of the bottles can be substantially reduced. A pyramid can be a plural angles such as a square, a pentagon, a hexagon, an octagon or the like. If the separable bottles are used as a standard bottle for drinks and pharmaceutical industries, the bottles are used for other various brands and kinds of drink and medicine, and more benefits from application of the bottles are expected.