Methods of making flexible containers

A method of forming a flexible container, the method comprising:

• providing a first sheet assembly portion with a first flexible outer sheet and a first flexible inner sheet, wherein:
• the first flexible inner sheet is a flexible material having a flexibility factor of 1,000-2,500,000 Newtons per meter;
• and
• the first flexible outer sheet is a flexible material having a flexibility factor of 1,000-2,500,000 Newtons per meter;
• joining at least a portion of the first flexible inner sheet to at least a portion of the first flexible outer sheet, to form:
• a first multi-wall panel, wherein:
• the first multi-wall panel is surrounded by seams that join the first flexible inner sheet to the first flexible outer sheet;
• the first flexible inner sheet and the first flexible outer sheet are in overlapping contact with each other between the seams, along substantially all of the first multi-wall panel;
• the first flexible inner sheet and the first flexible outer sheet are independent from one another along the first multi-wall panel;
• and
• the first multi-wall panel overlays a product volume;
• and
• at least a portion of the product volume, which includes the first flexible inner sheet but does not include the first flexible outer sheet;
• a first plurality of structural support volumes in the first sheet assembly portion, including:
• a first structural support volume on a left side of the first sheet assembly portion and at least partially bounding the first multi-wall panel;
• and
• a second structural support volume on a right side of the first sheet assembly portion and at least partially bounding the first multi-wall panel;
• and
• expanding each of the structural support volumes in the first plurality such that:
• the first structural support volume forms a first expanded structural support volume, which is a fillable space made from one or more flexible materials and filled with one or more gases at a pressure greater than atmospheric pressure, such that the first expanded structural support volume is made rigid;
• the second structural support volume forms a second expanded structural support volume, which is a fillable space made from one or more flexible materials and filled with one or more gases at a pressure greater than atmospheric pressure, such that the second expanded structural su ort volume is made rigid;
• and
• the first and second structural support volumes generate and maintain tension in the first multi-wall panel;
• and
• filling the product volume so that the product volume directly contains a fluent product.