A zipper (100) includes a male closure element (101) and a female closure element (102). The male closure element includes a base member (103), one or more male interlocking members (201,203) extending distally from a first side of the base member, and a plurality of guide posts (105,107) extending from a second side of the base member. The female closure element includes a base member (104), one or more female interlocking members (202,204) extending distally from a first side of the base member, and a plurality of guide posts (106,108) extending from a second side of the base member.