Double-stracture bag

A double structure bag comprising:

• an inner bag including a second food storage opening, wherein the inner bag includes a first and second bent portions located in an area adjacent to the second food storage opening, and wherein the first bent portion includes first openings at both side, and the second bent portion includes second openings at both side;
• an outer bag in which the inner bag is stored, having a first food storage opening, and two side surfaces facing to each other, wherein the outer bag includes two fourth openings, each of which is formed in the side surface, respectively, and
• two elongated zipping members, each of which is placed in in one of the first and second bent portions, respectively,
• wherein both ends of each elongated zipping members are placed outside the outer bag by passing through one of the fourth openings, respectively,
• whereby the second food storage openings are closed by pulling the two elongated zipping members from the side to side, and
• wherein the two elongated zipping members are tied together after the area where the first food storage opening formed is folded.