The present invention relates to a core material integrated into a backpack by sewing where a core material inserted in a back plate and a front plate are integrated into each other by sewing, thereby easily maintaining the entire form of the backpack and preventing the core material from freely moving in the back plate, and a round arc-shaped extra material is inserted in the front plate floor and front surface, thereby easily maintaining the front plate form. In the backpack of the present invention, the C-shaped front plate installed on the front and the number 1-shaped back plate installed on the back are sewn together, thereby forming a storage space which is opened and closed and inserting a plate-shaped core material in the back plate.
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