Patent ID: 7972255

Claim:
A method of preparing a self-supporting bag, comprising: molding a main body of the self-supporting bag, including a body portion and a bottom portion; folding the main body of the self-supporting bag, including the body portion and the bottom portion, such that the bottom portion is parallel to the body portion and the self-supporting bag is flat; and folding the folded self-supporting bag by standing up both side portions of the body portion and the bottom portion in a width direction while center portions of the body portion and the bottom portion remain flat such that the self-supporting bag is L-shaped on both of the side portions to maintain the self-supporting bag in a folded state, wherein the body portion includes a front surface such that, when the bag is folded by standing up both side portions of the body portion, a left side of the front surface faces a right side of the front surface with a center portion of the front surface located between the left side and the right side, and wherein the main body is comprised of synthetic resin.