A bottle closure assembly comprising: a cap portion, an elongated tether portion, and a retaining collar portion, the cap portion being molded to reversibly engage and cover a bottle opening, the retaining collar portion being molded to irreversibly engage a bottle neck or an upper portion of a bottle, and where the elongated tether portion connects at least one point on the cap portion to at least one point on the retaining collar portion, wherein the elongated tether portion comprises a tether strip which is frangibly connected along a portion of its upper edge to a descending annular edge of the cap portion and which is frangibly connected along a portion of its lower edge to an upper annular edge of the retaining collar portion, the tether strip being integrally formed with and connected at one end to at least one point on the cap portion and integrally formed with and connected at another end to at least one point on the retaining collar portion, the frangible sections being breakable when the cap portion is removed from a bottle opening, but where the cap portion remains connected to the retaining collar via the tether strip; characterized in that the cap portion, the elongated tether portion, and the retaining collar portion are integrally molded from a polyethylene homopolymer composition comprising: 95 to 5 weight% of a first ethylene homopolymer having a density of from 0.950 to 0.975 g/cm 3; and 5 to 95 weight% of a second ethylene homopolymer having a density of from 0.950 to 0.975 g/cm 3, wherein the ratio of the melt index I 2 of the second ethylene homopolymer to the melt index I 2 of the first ethylene homopolymer is at least 10, wherein the density is measured according to ASTM D792 and the melt index I 2 is measured according to ASTM D1238 at 190°C, using a 2.16 kg weight. a cap portion, an elongated tether portion, and a retaining collar portion, the cap portion being molded to reversibly engage and cover a bottle opening, the retaining collar portion being molded to irreversibly engage a bottle neck or an upper portion of a bottle, and where the elongated tether portion connects at least one point on the cap portion to at least one point on the retaining collar portion, wherein the elongated tether portion comprises a tether strip which is frangibly connected along a portion of its upper edge to a descending annular edge of the cap portion and which is frangibly connected along a portion of its lower edge to an upper annular edge of the retaining collar portion, the tether strip being integrally formed with and connected at one end to at least one point on the cap portion and integrally formed with and connected at another end to at least one point on the retaining collar portion, the frangible sections being breakable when the cap portion is removed from a bottle opening, but where the cap portion remains connected to the retaining collar via the tether strip; characterized in that the cap portion, the elongated tether portion, and the retaining collar portion are integrally molded from a polyethylene homopolymer composition comprising: 95 to 5 weight% of a first ethylene homopolymer having a density of from 0.950 to 0.975 g/cm 3; and 5 to 95 weight% of a second ethylene homopolymer having a density of from 0.950 to 0.975 g/cm 3, wherein the ratio of the melt index I 2 of the second ethylene homopolymer to the melt index I 2 of the first ethylene homopolymer is at least 10, wherein the density is measured according to ASTM D792 and the melt index I 2 is measured according to ASTM D1238 at 190°C, using a 2.16 kg weight. 95 to 5 weight% of a first ethylene homopolymer having a density of from 0.950 to 0.975 g/cm 3; and 5 to 95 weight% of a second ethylene homopolymer having a density of from 0.950 to 0.975 g/cm 3, wherein the ratio of the melt index I 2 of the second ethylene homopolymer to the melt index I 2 of the first ethylene homopolymer is at least 10, wherein the density is measured according to ASTM D792 and the melt index I 2 is measured according to ASTM D1238 at 190°C, using a 2.16 kg weight.