Milk jugs can be turned into durable quilting templates.
I recycle gallon plastic jugs into quilting templates that last practically forever. I use the almost square ones, like milk and water are bottled in. Cut the flat sides from the jugs, and lay them on the pattern. Use a ruler and fine-tip permanent marker to trace the pattern onto the plastic. Cut out the pieces and save them in small plastic bags labeled with the name of the quilt pattern; also include a small diagram of the finished block. This way you can have dozens of quilting templates at almost no cost.