The ornamental design for a portabledevice, as shown and described.
FIG. 1 is a perspective view of a portable device shown, with the portable device in an open state;
FIG. 2 is a front view thereof;
FIG. 3 is a rear view thereof;
FIG. 4 is a left side view thereof;
FIG. 5 is a right side view thereof;
FIG. 6 is a top view thereof;
FIG. 7 is a bottom plan view thereof;
FIG. 8 is a perspective view of the portable device shown, with the portable device in a close state; and,
FIG. 9 is a perspective view of the portable device showing an apparatus set in the portable device.
The broken lines showing the keyboard, the apparatus set in the portable device, and other features are for illustrative purpose only and form no part of the claimed design.