A surgical stapling loading unit including a first jaw and a second jaw movable relative to one another to perform a surgical stapling operation whereby staples are fired into target tissue, the loading unit comprising: a cartridge assembly supported on one of the first jaw and the second jaw, the cartridge assembly having a tissue contacting surface defining a longitudinally extending elongate slot and a plurality of staple retaining slots, wherein the cartridge assembly includes a staple in each staple retaining slot； an anvil assembly supported on the other of the first jaw and the second jaw, the anvil assembly including an anvil plate having a tissue contacting surface defining a longitudinally extending elongate slot and a plurality of staple forming pockets； a surgical buttress releasably disposed on at least one of the tissue contacting surface of the anvil assembly and the tissue contacting surface of the cartridge assembly, the surgical buttress or buttresses including a body portion overlying the staple retention slots of the staple cartridge assembly or the staple forming pockets of the anvil assembly, the buttress or buttresses having a first flap extending from a first side edge of the body portion, and a second flap extending from a second side edge of the body portion, each flap defining a respective aperture； and a suture securing the buttress or buttresses to the cartridge assembly and/or anvil assembly.
