Wall mount rack system, in particular 19-inch wall mount rack system, for accommodating electronic and/or network equipment modules, comprising a framework supporting cover arrangements (3, 4, 5, 6) as well as a hinged door to build a cabinet which limits an interior space, wherein the framework and the cover arrangements (3, 4, 5, 6) are designed to be size-flexible in such a way that at least a depth (d) of the so limitable interior space of the cabinet can be varied before and/or after being in its fully assembled state and/or during its assembly; wherein the framework comprises a base frame as well as a first left side frame and a first right side frame, each being hinged to the base frame, wherein the base frame is designed to fix the framework to a wall and each side frame (9, 10) is intended to be swung in relative to the base frame, in particular during a transport and/or store of the framework, and to be swung out relative to the base frame, in particular to support at least partially one of the associated cover arrangements (3, 4, 5, 6), relative to said base frame, wherein a second left side frame is slidably couplable to said first left side frame, and a second right side frame is slidably couplable to said first right side frame, wherein each second side frame (11, 12) is designed to be telescoped with respect to the associated first side frame (9, 10) and wherein said first side frames (9, 10) and said second side frames (11, 12) each comprise two arms (9a, 9b; 10a, 10b; 11a, 11b; 12a, 12b) extending in parallel to each other, and a crossbar (9c, 10c, 11c, 12c) connecting said arms (9a, 9b; 10a, 10b; 11a, 11b; 12a, 12b) of each side frame to one another, wherein the arms (9a, 9b; 10a, 10b; 11a, 11b; 12a, 12b) of each side frame are designed for being slidably coupled with the arms (9a, 9b; 10a, 10b; 11a, 11b; 12a, 12b) of the associated side frame. wherein the framework and the cover arrangements (3, 4, 5, 6) are designed to be size-flexible in such a way that at least a depth (d) of the so limitable interior space of the cabinet can be varied before and/or after being in its fully assembled state and/or during its assembly; wherein the framework comprises a base frame as well as a first left side frame and a first right side frame, each being hinged to the base frame, wherein the base frame is designed to fix the framework to a wall and each side frame (9, 10) is intended to be swung in relative to the base frame, in particular during a transport and/or store of the framework, and to be swung out relative to the base frame, in particular to support at least partially one of the associated cover arrangements (3, 4, 5, 6), relative to said base frame, wherein a second left side frame is slidably couplable to said first left side frame, and a second right side frame is slidably couplable to said first right side frame, wherein each second side frame (11, 12) is designed to be telescoped with respect to the associated first side frame (9, 10) and wherein said first side frames (9, 10) and said second side frames (11, 12) each comprise two arms (9a, 9b; 10a, 10b; 11a, 11b; 12a, 12b) extending in parallel to each other, and a crossbar (9c, 10c, 11c, 12c) connecting said arms (9a, 9b; 10a, 10b; 11a, 11b; 12a, 12b) of each side frame to one another, wherein the arms (9a, 9b; 10a, 10b; 11a, 11b; 12a, 12b) of each side frame are designed for being slidably coupled with the arms (9a, 9b; 10a, 10b; 11a, 11b; 12a, 12b) of the associated side frame.