I have a stack of pizza boxes that I painted with acrylic craft paints to match my sewing room. they look great stacked under my sewing table.
Great Hint Sallie!! I am so using that one!!
If you are shipping a quilt, they make perfect supports and fit in tubes (usually). Art quilters have used this method in competition mailings for years. Recently I began cutting them to size, and then cutting down through that hole, to insert into quilts for raised effects. I don't know about acidity, which is a concern with my art quilts. This is the next quilt I have cut the pieces for. They will maintain the support of the rolling fabric waves.