Abstract: A collapsible ink container assembly (30) for mounting to a piercing barb assembly (62) of an jet ink printer apparatus (74). The ink container assembly (30) comprises a flexible bladder (32) having a perimetric edge portion (34) which defines a distensible opening (36) to an interior portion (42). A substantially rigid wafer member (44) is provided which includes a needle receiving port (46) and an outwardly facing perimeter wall (48). The wafer (44) is positioned in the opening (36) such that the perimeter wall (48) distends the flexible bladder (32) to an open position (30). The edge portion (34) is coupled to the wafer (44) in a manner providing a first hermetic seal (49). A frangible membrane (50) cooperates with the receiving port (46) in a manner providing a second hermetic seal. The first seal (49) and the second seal cooperating to form an impervious seal to retain ink deposited in the interior portion ( 42) of the flexible bladder (32) from an exterior thereof.