The ornamental design for a samplevial, as shown and described.
FIG. 1 is a first perspective side view of my new design;
FIG. 2 is a bottom perspective thereof;
FIG. 3 second perspective side view thereof;
FIG. 4 is a front view thereof;
FIG. 5 is a rear view thereof;
FIG. 6 is a top view thereof;
FIG. 7 is a bottom view thereof;
FIG. 8 is a first side view thereof; and,
FIG. 9 is a second side view thereof.
The dot dash dot broken lines depict the boundaries of the claim in FIGS. 2 and 7 and form no part thereof. All other broken lines, the areas within them and all areas adjacent to shaded surfaces depict portions of the sample vial that form no part of the claim design.