The ornamental design for a personalfloatationdevice, as shown and described.
FIG. 1 is a perspective view of a personal floatation device showing my new design;
FIG. 2 is a front view thereof;
FIG. 3 is a rear view thereof;
FIG. 4 is a left view thereof;
FIG. 5 is a right view thereof;
FIG. 6 is a top view thereof;
FIG. 7 is a bottom view thereof; and,
FIG. 8 is a perspective view thereof shown in a use configuration with environment.
The broken lines shown in the figures represent portions of the personal flotation device that form no part of the claimed design. The broken lines in FIG. 8 depict environment of a child that forms no part of the claimed design.