(57) A bag-in-box (6) having at least two bags (8, 9) housed in an external box (7). The
two bags (8, 9) comprises first and second bags each formed of sheet-like material
and flexible. The first bag (8) serves as a container for containing a content therein
and the second bag (9) serves as a pressing member expandable upon injection of pressurized
fluid thereinto to compress the first bag (8). The first bag (8) is separated from
the second bag (9) and is stacked thereon in the external box (7). Alternatively,
one of the first and second bags is positioned inside the remaining one of the second
and first bag. Each of the first and second bags (8, 9) has tubular shape both ends
of which are fuse-bonded. Gusset type bag is also available as the first and second
bags (8, 9).
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