2 x A4 sized pieces of fabric
2 x A4 sized pieces of wadding
2 metres of bias binding
2 pieces of plastic canvas, the same size as your e-reader
Cut one of the pieces of wadding in half. This will be for the inside pieces - pin it to the inside cover fabric, with a small gap (around 1cm) between the two pieces. Pin the other piece of wadding to the second piece of fabric, for the outside cover. Remember to always pin to the reverse of the fabric! Sew the wadding to the fabric, and then trim the edges square.
Step 1: Sewing it all together
Pin the bias binding around the edges of the book cover, and sew on, leaving the top edge open. Once the other 3 sides are stitched closed, slide the plastic canvas into the open gaps (there should be one piece on each side) and stitch the gap closed.