(57) A thin walled plastic container (10) having an opening (14) therein includes a device
(18) for increasing the rigidity of the container, the device comprising an expandable
body (24) having an opening (28) therein, the-body (24) being located in the container
(10) with the opening (28) in the body in register with the opening (14) in the container
so that the interior of the body is in communication with the outside of the container
and not in communication with the interior of the container. The body (24) is adapted
to be expanded, e.g. by means of a gas, to increase the pressure in the ullage space
(34) of the container to increase the rigidity of the container (10) when the opening
(28) in the body and the opening (14) in the container are closed by closure means
(32) and (20). The increased rigidity of the container allows it to be transported
and stored more easily.
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