Abstract: A slider is disclosed for straddling relation with a profiled plastic zipper of a reclosable bag. The zipper has first and second interlocking profiles, and the straddling slider closes and opens the interlocking profiles by movement along the zipper. The slider includes a transverse support member and a pair of side walls extending downward from opposing sides of the support member. The side walls forming respective first and second shoulders extending inwardly toward each other. The first and second shoulders include respective first and second innermost ends facing and contacting respective adjacent portions of the reclosable bag below the respective first and second interlocking profiles. The first and second innermost ends define a tortuous path therebetween, and the adjacent portions of the reclosable bag pass through said tortuous path. The tortuous path is created by protrusions formed by at least one of the innermost ends.