Patent ID: 8814032

Claim:
A lunch box comprising a main body having a bottom portion, two side portions, a front portion and a back portion to define a receiving space, and a cover that is used to cover an upper portion of the main body connecting with and extending from the back portion of the lunch box, a method of closing the lunch box comprising steps of: holding the lunch box and the receiving space facing upwards; dividing each of the side portions into a retracting portion, an expanding portion and first shaping lines; dividing the cover into an upper unit, two side units and one front unit; and pressing the front portion toward the back portion to enable the retracting portions to inwardly move to further bring down the cover, wherein the front unit of the cover is configured to be disposed outside of the front portion of the lunch box; two side units of the cover are configured to be disposed outside the side portions of the lunch box; and the upper unit is configured to be disposed on top of the receiving space of the lunch box.