Felting wool fibres together creates a warm, dense fabric. The wool can be felted on a flat surface, or it can be shaped round a former such as a Hat Shaper. The former needs to be smooth, non-porous and able to withstand heat and water. A plastic bag or bubble wrap can be used between layers of fibre to stop it from felting and to create hollow forms. Linda Chapman's bag, pictured below, was made using this method.
There are numberous techniques for felt making and many of them are covered in the Fact File pages on our website. Our page Making Felt by Hand will help get you started and our selection of fibres and tools can be found in the Felt Making section.