The ornamental design for a multi-compartment organizer, as shown and described.
FIG. 1 is a top, front, right side perspective view of a multi-compartment organizer showing my new design;
FIG. 2 is a bottom, rear left side perspective view thereof;
FIG. 3 is a front elevational view thereof;
FIG. 4 is a rear elevational view thereof;
FIG. 5 is a right side elevational view thereof;
FIG. 6 is a left side elevational view thereof; and,
FIG. 7 is a top plan view thereof.
The broken lines showing surfaces inside the compartments in FIG. 7 are included for the purpose of illustrating portions of the top that form no part of the claimed design.