I have a large Block Butler, looks like batting, but is tacky on both sides. Stick it to a wall, and away you go. I have a quilting friend who has just bought the 1 yard square version, and she sticks it to her wardrobe door. It can be portable, because it is supplied with plastic covering on each side that can be replaced as and when. Also, when it loses its tackiness, the instructions say to wash it gently and the tackiness is restored, and it doesn't damage paintwork etc.