An apparatus configured to apply an adjunct material (110, 112) to at least one of a first stapling surface or a second stapling surface defined by an end effector of a surgical stapler, wherein the first stapling surface includes a plurality of staple apertures and the second stapling surface includes a plurality of staple forming pockets, the apparatus comprising: (a) a contact structure (314; 414; 510; 614; 714; 800; 902; 1010; 1212; 1312; 1412) defining a longitudinal axis, wherein the contact structure includes: (i) a first contact member (316; 416; 522; 622; 722; 802; 910; 1020; 1106; 1206; 1306; 1408), wherein the first contact member is configured to support a first portion of the adjunct material, and (ii) a second contact member (318; 418; 524; 624; 724; 804; 912; 1022; 1108; 1208; 1308; 1410) movably coupled with the first contact member, wherein the first and second contact members (316, 318; 416, 418; 522, 524; 622, 624; 722, 724; 802, 804; 910, 912; 1020, 1022; 1106, 1108; 1206, 1208; 1306, 1308; 1408, 1410) are configured to move away from one another in opposing directions toward the first and second stapling surfaces, respectively, to provide the contact structure (314; 414; 510; 614; 714; 800; 902; 1010; 1212; 1312; 1412) in an expanded state to apply the first portion of the adjunct material to the first stapling surface with the first contact member (316; 416; 522; 622; 722; 802; 910; 1020; 1106; 1206; 1306; 1408); and (b) an expansion mechanism (300; 400; 500; 600; 700; 806; 900; 1000; 1100; 1200; 1300; 1400) operatively coupled with the contact structure (314; 414; 510; 614; 714; 800; 902; 1010; 1212; 1312; 1412), wherein the expansion mechanism is selectively operable to transition the contact structure from a non-expanded state toward the expanded state; characterized in that: the second contact member is configured to support a second portion of the adjunct material; and the first and second contact members (316, 318; 416, 418; 522, 524; 622, 624; 722, 724; 802, 804; 910, 912; 1020, 1022; 1106, 1108; 1206, 1208; 1306, 1308; 1408, 1410) are configured to move away from one another in the opposing directions toward the first and second stapling surfaces, respectively, to provide the contact structure (314; 414; 510; 614; 714; 800; 902; 1010; 1212; 1312; 1412) in the expanded state to apply the second portion of the adjunct material to the second stapling surface with the second contact member (318; 418; 524; 624; 724; 804; 912; 1022; 1108; 1208; 1308; 1410). (a) a contact structure (314; 414; 510; 614; 714; 800; 902; 1010; 1212; 1312; 1412) defining a longitudinal axis, wherein the contact structure includes: (i) a first contact member (316; 416; 522; 622; 722; 802; 910; 1020; 1106; 1206; 1306; 1408), wherein the first contact member is configured to support a first portion of the adjunct material, and (ii) a second contact member (318; 418; 524; 624; 724; 804; 912; 1022; 1108; 1208; 1308; 1410) movably coupled with the first contact member, wherein the first and second contact members (316, 318; 416, 418; 522, 524; 622, 624; 722, 724; 802, 804; 910, 912; 1020, 1022; 1106, 1108; 1206, 1208; 1306, 1308; 1408, 1410) are configured to move away from one another in opposing directions toward the first and second stapling surfaces, respectively, to provide the contact structure (314; 414; 510; 614; 714; 800; 902; 1010; 1212; 1312; 1412) in an expanded state to apply the first portion of the adjunct material to the first stapling surface with the first contact member (316; 416; 522; 622; 722; 802; 910; 1020; 1106; 1206; 1306; 1408); and (i) a first contact member (316; 416; 522; 622; 722; 802; 910; 1020; 1106; 1206; 1306; 1408), wherein the first contact member is configured to support a first portion of the adjunct material, and (ii) a second contact member (318; 418; 524; 624; 724; 804; 912; 1022; 1108; 1208; 1308; 1410) movably coupled with the first contact member, (b) an expansion mechanism (300; 400; 500; 600; 700; 806; 900; 1000; 1100; 1200; 1300; 1400) operatively coupled with the contact structure (314; 414; 510; 614; 714; 800; 902; 1010; 1212; 1312; 1412), wherein the expansion mechanism is selectively operable to transition the contact structure from a non-expanded state the second contact member is configured to support a second portion of the adjunct material; and the first and second contact members (316, 318; 416, 418; 522, 524; 622, 624; 722, 724; 802, 804; 910, 912; 1020, 1022; 1106, 1108; 1206, 1208; 1306, 1308; 1408, 1410) are configured to move away from one another in the opposing directions toward the first and second stapling surfaces, respectively, to provide the contact structure (314; 414; 510; 614; 714; 800; 902; 1010; 1212; 1312; 1412) in the expanded state to apply the second portion of the adjunct material to the second stapling surface with the second contact member (318; 418; 524; 624; 724; 804; 912; 1022; 1108; 1208; 1308; 1410).