Flask

FIG. 1 is an exploded top perspective view of a flask showing our new design;

FIG. 2 is an exploded bottom perspective view thereof;

FIG. 3 is a top perspective view of the flask shown in an assembled configuration;

FIG. 4 is a front side view thereof;

FIG. 5 is a back side view thereof;

FIG. 6 is a top side view thereof; and,

FIG. 7 is a bottom side view thereof.

The broken lines in the drawings depict portions of the flask that form no part of the claimed design.