Abstract: In order to provide a zip closure system that is difficult for a thief to operate, the system comprises a first zip slider (40), capable of fastening and unfastening the teeth, of a zip closure, and at least one of a second zip slider (41) and an end of a zip closure, the first zip slider (40) having a first handle (43) and the second zip slider (41) having a second handle (45), the handles (44,45) being configured so that when the first slider (40) is adjacent to the second slider (41), the first handle (43) overlies the second slider (41) and the second handle (45) overlies the first slider (40). The first and second handles (43, 45) can be released by moving right or left. A range of products can be provided which operate according to the same principles, but in which the first movement, for example left or right, varies between different products of the range.