Abstract: To prevent a reduction in a bending strength and a buckling strength of a container bag for fluid in which a spout is mounted on an upper end of a trunk section formed of a sheet material. Cells 9 are formed between two films of the sheet material 2 by bonding the films together along bonding lines 8, and inflated with fluid. The cells 9 positioned within a width of the spout in a width direction of the trunk section 5 extends downwardly from a site at which the spout 6 is clamped by the layers of the sheet material 2. A lower end of the spout 6 is situated lower than upper ends of the cells 9.

Abstract: To provide a container bag 34 that can be manufactured easily by folding a sheet material 1 precisely along a folding line 11B. The sheet material 1 is prepared by bonding two films 2 and 3 together in a predetermined pattern, and the sheet material 1 comprises a plurality of cells 16 formed between the two films 2 and 3 while being joined to one another to be filled with fluid. A trunk portion 17 to be filled with a content is formed by bonding overlapping layers of a peripheral edge 9A of the folded sheet material 1. A bottom portion 13 of the container bag 34 is folded inwardly toward the trunk portion 17 along the folding line 11B. A non-bonded section 14 in which the two films 2 and 3 are not bonded together is maintained linearly within the folding line 11B.

Abstract: To provide a container bag 34 that can be manufactured easily by folding a sheet material 1 precisely along a folding line 11B. The sheet material 1 is prepared by bonding two films 2 and 3 together in a predetermined pattern, and the sheet material 1 comprises a plurality of cells 16 formed between the two films 2 and 3 while being joined to one another to be filled with fluid. A trunk portion 17 to be filled with a content is formed by bonding overlapping layers of a peripheral edge 9A of the folded sheet material 1. A bottom portion 13 of the container bag 34 is folded inwardly toward the trunk portion 17 along the folding line 11B. A non-bonded section 14 in which the two films 2 and 3 are not bonded together is maintained linearly within the folding line 11B.