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A disposable bag for a liquid shipping container has a multi ply region arranged to be inflated as the bag empties in such a way as to form a sump at the bag bottom for discharge of pumpable material from the sump.

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1. A system of enhancing discharge of pumpable material from a material discharge zone disposed at a bottom of a disposable plastic bag arranged within a supporting container so that a bottom of the bag contacts a bottom of the container and underlies material contained in the bag, the system compri

1. A system of enhancing discharge of pumpable material from a material discharge zone disposed at a bottom of a disposable plastic bag arranged within a supporting container so that a bottom of the bag contacts a bottom of the container and underlies material contained in the bag, the system comprising:a. at least a portion of the bag being formed of multiple plies secured together in a configuration that confines inflating air within an inflatable region between the secured together plies; b. the ply securing configuration being arranged to dispose the inflatable region outside the discharge zone at the bottom of the bag; c. an air delivery system arranged to urge air into the inflatable region when the bag is disposed in a container and at least partly filled with the material; and d. the ply securing configuration being arranged so that the air plumps the inflatable region of the bag and, as weight of the material remaining in the bag permits, raises above the bottom of the container a ply of the bag contacting the material whereupon gravity makes the material flow downward along a slope of the raised ply into the sump in the discharge zone where the material is discharged from the bag.