Packing member for liquid container

A packing member for packing a liquid container including a flexible bag having a first face and a second face arranged to sandwich a liquid storage portion in a T direction, and a liquid output port provided on one edge of the bag and having a central axis that runs along a D direction, wherein three directions orthogonal to each other are defined as the T direction, the D direction, and a W direction,

• the packing member comprising:
• a first section arranged to face the first face along a DW plane that includes the D direction and the W direction;
• a second section arranged to face the second face along the DW plane, and sandwiches the bag in the T direction in cooperation with the first section;
• a fixing portion that fixes the first section and the second section in a state of sandwiching the bag in the T direction;
• and
• a pressurizing portion that presses a region of a portion of the bag sandwiched between the first section and the second section such that, in a fixed state where the bag is fixed between the first section and the second section by the fixing portion, pressure in the liquid storage portion becomes higher than pressure before the fixed state is entered.