I claim the ornamental design for a plastic bottle, as shown and described.
FIG. 1 is a perspective view of a plastic bottle according to the present design;
FIG. 2 is a front elevation view of the plastic bottle of FIG. 1, the rear elevation view being identical with the exception of the upper and lower boundaries.
FIG. 3 is a right elevation view of the plastic bottle of FIG. 1, the left elevation view being identical with the exception of the upper and lower boundaries.
FIG. 4 is a top view of the plastic bottle of FIG. 1; and,
FIG. 5 is a bottom view of the plastic bottle of FIG. 1.
The evenly broken lines are shown for the purpose of illustrating portions of the plastic bottle and form no part of the claimed design. The dash-dot-dash broken lines define the bounds of the claimed design and form no part thereof.