The ornamental design for a design for a reclosableslider zipper flexible bag, as shown and described.
FIG. 1 is a front perspective view of a reclosable slider zipper flexible bag showing my new design;
FIG. 2 is a left front view thereof;
FIG. 3 is another perspective view thereof;
FIG. 4 is a front elevational view, wherein one of the tear-off pockets is in an open condition; and,
FIG. 5 is another perspective view; one of the tear-off pockets is removed.
The broken line showing of portions the reclosable slider zipper flexible bag is included for the purpose of illustrating environmental structure and form no part of the claimed design.