To reduce dimensions at the time of disposal by forming an entire bottle from synthetic resin into a cylindrical or prism and by providing bellows.

Bellows 2 which can stretch downward from a shoulder provided from the shoulder of a bottle 1 toward a lower bottom 4 are provided on a side (body) of the bottle 1 made of synthetic resin. The bottle 1 is integrally formed with a column-like body 5 having a thin cylinder mouth 3 and standing to protrude upward from a center on the bottom 4. During normal use of the bottle 1, the bellows 2 are stretched, so that it has a certain capacity and is used as an inherent container for receiving contents. When the contents in the bottle 1 have been consumed, the bottle 1 is empty, and this is to be thrown out, the bottle 1 is reduced in dimensions by folding the bellows 2, the column- like body 5 is pressed into the cylinder mouth 3 and fixed to keep the reduced state of the bottle 1, and a volume of the bottle 1 is kept reduced.