A fiber optic splice tray comprising: a substantially oblong major surface defined by major and minor axes (A1, A2), the minor axis being perpendicular to the major axis, the splice tray extending parallel to the major axis from a left side of the splice tray to a right side of the splice tray; first and second splice circuits supported on the major surface, each of the first and second splice circuits comprising: a splice holder area (232, 238) supported on the major surface and including a plurality of splice holders, a first spooling structure (228, 234) including a wall (229, 235) defining a closed shape protruding from the major surface, the wall enclosing a substantially oblong shape defined by major and minor axes (A3, A4), the first spooling structure being positioned to the left side of the splice holder area; and a second spooling structure (230, 236) including a wall (231, 237) defining a closed shape protruding from the major surface, the wall enclosing a substantially oblong shape defined by major and minor axes (A3, A4), the second spooling structure being positioned to the right side of the splice holder area; wherein the splice holder areas of the first and second circuits are separated from each other; wherein the splice holder area, the first spooling structure and the second spooling structure of the first circuit are substantially aligned on the major surface parallel to the major axis of the major surface; wherein the splice holder area, the first spooling structure and the second spooling structure of the second circuit are substantially aligned on the major surface parallel to the major axis of the major surface wherein each of the major axes of the spooling structures is oriented obliquely to both the major and minor axes of the major surface of the splice tray. a substantially oblong major surface defined by major and minor axes (A1, A2), the minor axis being perpendicular to the major axis, the splice tray extending parallel to the major axis from a left side of the splice tray to a right side of the splice tray; first and second splice circuits supported on the major surface, each of the first and second splice circuits comprising: a splice holder area (232, 238) supported on the major surface and including a plurality of splice holders, a first spooling structure (228, 234) including a wall (229, 235) defining a closed shape protruding from the major surface, the wall enclosing a substantially oblong shape defined by major and minor axes (A3, A4), the first spooling structure being positioned to the left side of the splice holder area; and a second spooling structure (230, 236) including a wall (231, 237) defining a closed shape protruding from the major surface, the wall enclosing a substantially oblong shape defined by major and minor axes (A3, A4), the second spooling structure being positioned to the right side of the splice holder area; a splice holder area (232, 238) supported on the major surface and including a plurality of splice holders, a first spooling structure (228, 234) including a wall (229, 235) defining a closed shape protruding from the major surface, the wall enclosing a substantially oblong shape defined by major and minor axes (A3, A4), the first spooling structure being positioned to the left side of the splice holder area; and a second spooling structure (230, 236) including a wall (231, 237) defining a closed shape protruding from the major surface, the wall enclosing a substantially oblong shape defined by major and minor axes (A3, A4), the second spooling structure being positioned to the right side of the splice holder area; wherein the splice holder areas of the first and second circuits are separated from each other; wherein the splice holder area, the first spooling structure and the second spooling structure of the first circuit are substantially aligned on the major surface parallel to the major axis of the major surface; wherein the splice holder area, the first spooling structure and the second spooling structure of the second circuit are substantially aligned on the major surface parallel to the major axis of the major surface wherein each of the major axes of the spooling structures is oriented obliquely to both the major and minor axes of the major surface of the splice tray.