Square basket

After seeing a picture of a square basket in a book this week, I decided to have a go.  The pattern in the book said to use vilene which I did but it still did not stand up enough for me.  Mmmm do I use batting and quilt it or just go with the flow?  I decided to use some of my iron on batting and quilted lines 2" apart.  It seems quite stable but obviously the more quilting the firmer it is.