The ornamental design for a milkbottlesleeve, as shown and described.
FIG. 1 is a perspective view of a milk bottle sleeve showing my new design;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a rear elevational view thereof;
FIG. 4 is a left side view thereof;
FIG. 5 is a right side view thereof;
FIG. 6 is a top plan view thereof; and,
FIG. 7 is a bottom plan view thereof.
The milk bottle shown in broken lines in FIG. 1 shows how the sleeve is used, and forms no part of the claim. The broken lines showing stars, and circles along with the outer broken lines of the small circular protuberances throughout the views, represent boundaries of the design. The broken lines themselves form no part of the claim.