Have you ever bought a neck pillow and felt uncomfortable using it?
I do, most of the time!
If you dont have a printer, then simply draw a pattern on a piece of paper.

Image Credit: Hello Sewing via YouTube
Draw one half of the travel pillow shape, just like a bean, then cut it out.
Pin it in place and cut through both layers, repeat and cut out another piece of fabric.
Unfold both fabrics, then stack them together with their right sides facing each other.

Leave a gap of about 2 inches unstitched for turning.
Turn the fabric inside out through the gap/opening, then poke the edges.
ensure that the seam allowance of the gap is tucked in before pressing it with an iron.

Close up the opening by hand stitching it with a ladder stitch.
*All these images are credited toHello Sewingvia YouTube.