We claim the ornamental design for a knife sheath, as shown and described.
FIG. 1 is an isometric view of a knife sheath;
FIG. 2 is a right side elevational view thereof;
FIG. 3 is a left side elevational view thereof;
FIG. 4 is a rear elevational view thereof;
FIG. 5 is a front elevational view thereof;
FIG. 6 is a top plan view thereof; and,
FIG. 7 is a bottom plan view thereof.
The ornamental design which is claimed is shown in solid lines in the drawings. The broken lines in the drawings are for illustrative purposes only and show unclaimed portions of the claimed design.
While the accompanying drawings illustrate various exemplary embodiments, it should be understood that according to other exemplary embodiments that should be considered to be within the possession of the inventors of the present application at the time this application is being filed, it is contemplated that any illustrated solid lines may be converted to broken lines and that any illustrated broken lines may be converted to solid lines so as to claim or disclaim portions, components, or sub-components of the designs shown.