The ornamental design for a shakerbottleagitator, as shown and described.
FIG. 1 is a front perspective view of a shaker bottle agitator;
FIG. 2 is a front elevation view of the shaker bottle agitator;
FIG. 3 is rearward elevation view of the shaker bottle agitator;
FIG. 4 is a left-side elevation view of the shaker bottle agitator;
FIG. 5 is a right-side elevation view of the shaker bottle agitator;
FIG. 6 is a top plan view of the shaker bottle agitator;
FIG. 7 is a bottom plan view of the shaker bottle agitator; and,
FIG. 8 is an environmental perspective view of the shaker bottle agitator installed on an unclaimed shaker bottle.
The broken lines in the drawings depict portions of the shaker bottle agitator and environmental subject matter that form no part of the claimed design.