(57) A collapsible multilayer bag (10) formed from a plurality of substantially impermeable
plastics sheets (14, 15,16) joined together around their peripheries is located within
an inextensible outer casing, e.g. a cylindrical cardboard casing (11) with end plates
(12, 13). Liquid, such as beer, can be filled into a first interlayer space (27) of
the bag (10) via first inlet/outlet means (17) against a counter pressure provided
by a pressure medium, such as air or water, in second interlayer space (28) which
is gradually bled off via second inlet/outlet means (18). The liquid is subsequently
dispensed by controlled supply of pressure medium to the second interlayer space (28)
so as to exert pressure on the liquid filled space (27).
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