My sister and I made portable "walls" that we can bring to each other's houses when working together.
We used the tri-fold display boards (the kind students use for science fair projects) and covered them with flannel. We cut the flannel several inches larger than the board so we could wrap it around the edges and used a hot glue gun to glue it to the back.
This can be closed flat for storage and can be closed with a WIP inside and moved from place to place without disturbing your work.