Patent ID: 7597691

Claim:
A liquid storage bag comprising: a bag body having a top portion and a bottom portion, said bag body having an internal space therein; an opening and closing device having ends in said top portion; heat seals provided adjacent both ends of said opening and closing device; a liquid outlet provided on said bottom portion; a peelable partition wall having ends configured to divide in a liquid-tight manner said internal space into a lower space and an upper space; and including a hanging device adjacent one end of said opening and closing device, one end of said peelable partition wall, and one heat seal, wherein said partition wall has end portions and a central portion located at a center of said partition wall halfway between said end portions, said central portion having a convex shape, wherein said partition wall has a width that increases continuously from a reduced width portion at said center portion to increased width portions at said end portions where said width is defined as a distance between said upper space and said lower space, and said width of said end portions are at least two times greater than said width of said center portion.