The ornamental design for a drinkcooler, as shown and described.
FIG. 1 is a top perspective view of our design;
FIG. 2 is a top view of our design;
FIG. 3 is a bottom view of our design;
FIG. 4 is a front view of our design;
FIG. 5 is a cross-section view of our design;
FIG. 6 is a front view of our design illustrated with an exploded view;
FIG. 7 is a top perspective view of our design illustrated with an exploded view;
FIG. 8 is a top perspective view of our design;
FIG. 9 is a top view of our design;
FIG. 10 is a bottom view of our design;
FIG. 11 is a front view of our design; and,
FIG. 12 is a cross-section view of our design.
The dashed lines in FIGS. 1-2 and 4-7 represent environmental structure and form no part of the claimed design. All other surface(s) or portion(s) of our design not shown in the figures or otherwise described in the specification form no part of the claimed design.