Flask

FIG. 1 is a perspective view of a flask showing our new design in environmental use;

FIG. 2 is an exploded, reduced scale perspective view thereof;

FIG. 3 is a front elevation view thereof;

FIG. 4 is a rear elevation view thereof;

FIG. 5 is a left-side elevation view thereof;

FIG. 6 is a right-side elevation view thereof; and,

FIG. 7 is a top plan view thereof.

Broken lines in the figures illustrate portions of the flask that form no part of the claimed design. The broken lines illustrating the band in FIG. 1 illustrate environmental subject matter only and form no part of the claimed design.