The ornamental design for a lanyardslider with holders for writing implements, as shown and described.
FIG. 1 is a left-side, top, and front perspective view of a lanyard slider with holders for writing implements showing our new design at an enlarged scale;
FIG. 2 is a top plan view thereof;
FIG. 3 is a bottom plan view thereof;
FIG. 4 is a left-side elevational view thereof;
FIG. 5 is a front elevational view thereof;
FIG. 6 is a rear elevational view thereof; and,
FIG. 7 is left, front, and top perspective view thereof showing the lanyard slider with holders for writing implements in use with a writing implement and a portion of a lanyard cord, where the objects shown in broken lines are shown for the purpose of illustrating environment and form no part of the claimed design.