To deform a container compactly when there is no content to facilitate storage and transportation of the container by making a set of opposite sides of the container foldable outward and the other set of opposite sides of the container foldable inward.

The container 1 is equipped with a handle 9 for holding the container and a mouth 7 for filling contents on an upper face 5, while a flat face is formed on a lower face 6. A cap 8 is attached to the mouth 7. A pair of first sides 3 swell outward, while another pair of seconds sides 4 are recessed inward. Approximately X-shaped recesses 2 connecting ends are provided on the pair of opposite first sides 3, a horizontal recess 2 passing through an approximately X-shaped intersection 10 is provided through the pair of second sides 4, and recesses 11, 12 are provided through the pair of second sides 4 horizontally at upper and lower ends of the side. The container 1 is held by the handle 9 with the cap 8 removed and pushed downward, thereby discharging air in the container to be folded for facilitating storage and transportation.