A rack system (100, 200) comprising: a support frame; a first shelf mounted to the support frame, the first shelf having a first product support deck extending between a front end and a rear end; a second shelf mounted to the support frame, the second shelf having a second product support deck, the first and second shelves being vertically spaced with the second shelf being vertically above the first shelf; and a backing wall having a wall portion mounted to the first shelf, the wall portion extending vertically between the first and second shelves, the backing wall being adjustably positionable between the front and rear end of the first product support deck to adjust a spacing between the wall portion and the front end of the first product support deck, wherein the wall portion of the backing wall includes an array of apertures formed therethrough; wherein the array of apertures is formed from a first portion of apertures laterally offset from a second portion of apertures; the wall portion having a column of second apertures positioned between the first and second portions; the apertures of the array of apertures having a first diameter, the apertures of the column of second apertures having a second diameter different than the first diameter, wherein: the wall portion includes a first panel portion and a second panel portion mounted adjacent the first panel portion; the first panel portion including a column of mounting apertures; the second panel portion including at least one positioning stud sized to be received in the apertures of the column of mounting apertures to adjust the positioning of the second panel portion relative to the first panel portion to adjust the vertical height of the backing wall; wherein the backing wall includes at least one mounting hook that has a downward extending portion and a horizontal extending portion; and the product support deck of the first shelf includes a first aperture formed therein, the downward extending portion extending through the first aperture with the forward extending portion extending under the product support deck. a support frame; a first shelf mounted to the support frame, the first shelf having a first product support deck extending between a front end and a rear end; a second shelf mounted to the support frame, the second shelf having a second product support deck, the first and second shelves being vertically spaced with the second shelf being vertically above the first shelf; and a backing wall having a wall portion mounted to the first shelf, the wall portion extending vertically between the first and second shelves, the backing wall being adjustably positionable between the front and rear end of the first product support deck to adjust a spacing between the wall portion and the front end of the first product support deck, wherein the wall portion of the backing wall includes an array of apertures formed therethrough; wherein the array of apertures is formed from a first portion of apertures laterally offset from a second portion of apertures; the wall portion having a column of second apertures positioned between the first and second portions; the apertures of the array of apertures having a first diameter, the apertures of the column of second apertures having a second diameter different than the first diameter, wherein: the wall portion includes a first panel portion and a second panel portion mounted adjacent the first panel portion; the first panel portion including a column of mounting apertures; the second panel portion including at least one positioning stud sized to be received in the apertures of the column of mounting apertures to adjust the positioning of the second panel portion relative to the first panel portion to adjust the vertical height of the backing wall; wherein the backing wall includes at least one mounting hook that has a downward extending portion and a horizontal extending portion; and the product support deck of the first shelf includes a first aperture formed therein, the downward extending portion extending through the first aperture with the forward extending portion extending under the product support deck. the wall portion includes a first panel portion and a second panel portion mounted adjacent the first panel portion; the first panel portion including a column of mounting apertures; the second panel portion including at least one positioning stud sized to be received in the apertures of the column of mounting apertures to adjust the positioning of the second panel portion relative to the first panel portion to adjust the vertical height of the backing wall; wherein the backing wall includes at least one mounting hook that has a downward extending portion and a horizontal extending portion; and the product support deck of the first shelf includes a first aperture formed therein, the downward extending portion extending through the first aperture with the forward extending portion extending under the product support deck.