A separator of items of the bottle type for use in a box, said separator comprising a longitudinal partition wall that is adapted to separate two opposing rows of bottles, characterised in that the separator comprises a first type of sheet and a second type of sheet, - wherein each sheet and has a central partition wall, and two vertical equidistant flaps,, - with each flap, comprising two adjacent vertical portions: - a first vertical portion, that is distal to the respective central partition wall,, and - a second vertical portion, that is proximal to the respective central partition wall, located with respect to vertical folding lines, that join each flap, to their corresponding sheet,; wherein the first vertical portion, has the same height as said central partition wall,; - wherein the central partition wall of the first sheet comprises two separating vertical portions formed each one by a first cutting line, said first cutting line being formed by a vertical section and two inclined sections; and - wherein the central partition wall of the second sheet comprises separating upper and lower portions generated each one by second cutting lines, said second cutting lines being formed by one vertical section and one inclined section, such that the central partition walls,, enable the formation of a continuous surface at the separator ends for providing a separator enabling reliable separation for each of the bottles. - wherein each sheet and has a central partition wall, and two vertical equidistant flaps,, - with each flap, comprising two adjacent vertical portions: - a first vertical portion, that is distal to the respective central partition wall,, and - a second vertical portion, that is proximal to the respective central partition wall, located with respect to vertical folding lines, that join each flap, to their corresponding sheet,; - a first vertical portion, that is distal to the respective central partition wall,, and - a second vertical portion, that is proximal to the respective central partition wall, located with respect to vertical folding lines, that join each flap, to their corresponding sheet,; wherein the first vertical portion, has the same height as said central partition wall,; - wherein the central partition wall of the first sheet comprises two separating vertical portions formed each one by a first cutting line, said first cutting line being formed by a vertical section and two inclined sections; and - wherein the central partition wall of the second sheet comprises separating upper and lower portions generated each one by second cutting lines, said second cutting lines being formed by one vertical section and one inclined section, - wherein the central partition wall of the first sheet comprises two separating vertical portions formed each one by a first cutting line, said first cutting line being formed by a vertical section and two inclined sections; and - wherein the central partition wall of the second sheet comprises separating upper and lower portions generated each one by second cutting lines, said second cutting lines being formed by one vertical section and one inclined section, such that the central partition walls,, enable the formation of a continuous surface at the separator ends for providing a separator enabling reliable separation for each of the bottles.