What is claimed is the ornamental design for a leather tumbler sleeve, as shown and described.
FIG. 1 is an environmental perspective view of the leather tumbler sleeve showing Applicant's new design.
FIG. 2 is a front elevational view thereof.
FIG. 3 is a rear elevational view thereof.
FIG. 4 is a left elevational view thereof.
FIG. 5 is a right elevational view thereof.
FIG. 6 is a top-down view thereof; and,
FIG. 7 is a bottom-up view thereof.
The structural features depicted by broken lines in the Figures have been provided for the purpose of illustrating portions of the leather tumbler sleeve that form no part of the claimed design.