FIG. 1 provides a perspective view of the zipper locking device appearing within its usual operational environment associated with other zipper structure.

FIG. 2 provides a perspective view of the zipper locking device.

FIG. 3 provides a front elevational view of the zipper locking device.

FIG. 4 provides a rear elevational view of the zipper locking device.

FIG. 5 provides a right side elevational view of the zipper locking device.

FIG. 6 provides a top plan view of the zipper locking device; and,

FIG. 7 provides a bottom plan view of the zipper locking device.

The broken line showing of the zipper structure is for illustrative purposes only and forms no part of the claimed design.