Well, 50c was for the pillowcase - the thread and my time are extra. Basically, you slice a pillowcase on the diagonal
tidy up the raw edges
flip one triangle around, and sew together.
You then tie the pointy ends and voila - a bag!!! I was happy with the result in general, but found it wasn't long enough to be comfortable under my arm. I saw the idea on line and just wanted to try it - and now I have!!!