The ornamental design for a strawcase, as shown and described.
FIG. 1 is a perspective view of a straw case showing our new design in a closed configuration;
FIG. 2 is a front elevation view thereof;
FIG. 3 is a rear elevation view thereof;
FIG. 4 is a right side elevation view thereof;
FIG. 5 is a left side elevation view thereof;
FIG. 6 is the top plan view thereof;
FIG. 7 is the bottom plan view thereof; and,
FIG. 8 is a perspective view of a straw case in an open configuration.
The broken lines showing clips, straws and a straw cleaner depict environmental subject matter that forms no part of the claimed design. All other broken lines depict portions of the straw case that form no part of the claimed design.