The ornamental design for a nestable and stackablechair, as shown and described.
FIG. 1 is a front perspective view of a nestable and stackable chair showing our new design;
FIG. 2 is a rear perspective view of the design shown in FIG. 1;
FIG. 3 is a side elevational view of the design shown in FIG. 1, with the seat bottom of the chair in a first position, with the opposite side being a mirror image;
FIG. 4 is a side elevational view of the design shown in FIG. 3, with the seat bottom of the chair in an extended second position; and,
FIG. 5 is a side elevational view of the design shown in FIG. 3, with the seat bottom of the chair in a folded upright position.