A buttress applier cartridge assembly, comprising: (a) a first buttress assembly, including: (i) a first buttress configured to be received against tissue and support a staple formed therein, and (ii) a first adhesive layer on the first buttress configured to releasably adhere the first buttress against a first portion of an end effector of a surgical stapler upon engaging the first adhesive layer against the end effector with at least a predetermined minimum force; and (b) a buttress applier cartridge, including: (i) a housing defining a first gap extending in a longitudinal direction therealong such that the first gap is configured to receive the first portion of the end effector, and (ii) a platform extending longitudinally from a proximal platform portion to a distal platform portion and operatively connected to the housing, wherein the platform is exposed in a transverse direction adjacent to the first gap and the proximal and distal platform portions respectively have a proximal stiffness and a different, distal stiffness in the transverse direction, wherein the proximal and distal platform portions support the first buttress assembly thereon and are configured to deform with the proximal and distal stiffnesses thereby providing reactionary forces of at least the predetermined minimum force while receiving the end effector for accommodating various camber orientations of the end effector, and wherein the platform includes a platform pad, and characterised in that the platform further includes a plurality of reliefs in at least one of the proximal and distal platform portions, wherein the plurality of reliefs are configured to generate the differing proximal and distal stiffnesses in the platform. (a) a first buttress assembly, including: (i) a first buttress configured to be received against tissue and support a staple formed therein, and (ii) a first adhesive layer on the first buttress configured to releasably adhere the first buttress against a first portion of an end effector of a surgical stapler upon engaging the first adhesive layer against the end effector with at least a predetermined minimum force; and (i) a first buttress configured to be received against tissue and support a staple formed therein, and (ii) a first adhesive layer on the first buttress configured to releasably adhere the first buttress against a first portion of an end effector of a surgical stapler upon engaging the first adhesive layer against the end effector with at least a predetermined minimum force; and (b) a buttress applier cartridge, including: (i) a housing defining a first gap extending in a longitudinal direction therealong such that the first gap is configured to receive the first portion of the end effector, and (ii) a platform extending longitudinally from a proximal platform portion to a distal platform portion and operatively connected to the housing, wherein the platform is exposed in a transverse direction adjacent to the first gap and the proximal and distal platform portions respectively have a proximal stiffness and a different, distal stiffness in the transverse direction, wherein the proximal and distal platform portions support the first buttress assembly thereon and are configured to deform with the proximal and distal stiffnesses thereby providing reactionary forces of at least the predetermined minimum force while receiving the end effector for accommodating various camber orientations of the end effector, and wherein the platform includes a platform pad, and characterised in that the platform further includes a plurality of reliefs in at least one of the proximal and distal platform portions, wherein the plurality of reliefs are configured to generate the differing proximal and distal stiffnesses in the platform. (i) a housing defining a first gap extending in a longitudinal direction therealong such that the first gap is configured to receive the first portion of the end effector, and (ii) a platform extending longitudinally from a proximal platform portion to a distal platform portion and operatively connected to the housing, wherein the platform is exposed in a transverse direction adjacent to the first gap and the proximal and distal platform portions respectively have a proximal stiffness and a different, distal stiffness in the transverse direction, wherein the proximal and distal platform portions support the first buttress assembly thereon and are configured to deform with the proximal and distal stiffnesses thereby providing reactionary forces of at least the predetermined minimum force while receiving the end effector for accommodating various camber orientations of the end effector, and wherein the platform includes a platform pad, and characterised in that the platform further includes a plurality of reliefs in at least one of the proximal and distal platform portions, wherein the plurality of reliefs are configured to generate the differing proximal and distal stiffnesses in the platform. wherein the proximal and distal platform portions support the first buttress assembly thereon and are configured to deform with the proximal and distal stiffnesses thereby providing reactionary forces of at least the predetermined minimum force while receiving the end effector for accommodating various camber orientations of the end effector, and wherein the platform includes a platform pad, and characterised in that the platform further includes a plurality of reliefs in at least one of the proximal and distal platform portions, wherein the plurality of reliefs are configured to generate the differing proximal and distal stiffnesses in the platform.