The utility model belongs to the technical field of the saddlebag technique and specifically relates to a blade holder formula saddlebag, is equipped with square inclusion, its characterized in that square inclusion includes base, left casing and right casing, and the base up end is equipped with the parallel slot that is used for fixed activity page or leaf, and the base both sides are respectively through the one end fixed connection of hinge with left casing and right casing, and the other end of left casing and right casing is equipped with the buckle of mutually supporting, be equipped with perpendicular type slot on the both sides face of activity page or leaf, the preceding terminal surface and the rear end face of activity page or leaf are equipped with the spacer pin respectively, be equipped with limited motion page or leaf maximum opening's stay cord between the spacer pin of two adjacent activity pages or leaves, left side casing and right casing and adjacent moving about are equipped with folding bracket respectively between the page or leaf, folding bracket's one end and the fixed pin on left casing or the right casing are connected, the other end is connected with the spacer pin on left casing or the adjacent activity page or leaf of right casing, reasonable in design has, simple structure, advantages such as work efficiency height.