The ornamental design for a multi-drug delivery system, as shown and described.
FIG. 1 is a perspective view of a multi-drug delivery system showing our new design;
FIG. 2 is a front elevation view thereof;
FIG. 3 is a rear elevation view thereof;
FIG. 4 is a right side elevation view thereof;
FIG. 5 is a left side elevation view thereof;
FIG. 6 is a top plan view thereof; and,
FIG. 7 is a bottom plan view thereof.
The even-length broken lines showing of the multi-drug-delivery system and the uneven-length broken lines showing the unclaimed elements are for environmental purposes only and form no part of the claimed design.