The ornamental design for a portableyogatravel bolster, as shown and described.
FIG. 1 is a top view of the unzipped present invention.
FIG. 2 is a bottom view of the unzipped present invention.
FIG. 3 is a front view of the unzipped present invention.
FIG. 4 is a back view of the unzipped present invention.
FIG. 5 is a left view of the unzipped present invention.
FIG. 6 is a right view of the unzipped present invention.
FIG. 7 is a perspective view of the unzipped present invention.
FIG. 8 is a top view of the zipped present invention; and,
FIG. 9 is perspective view of the zipped present invention with filling.
The broken lines showing the tree/leaf pattern and filling inside of the bolster are for environmental purposes only and form no part of the claimed design.