You will need:
Cotton fabric – a bit more than twice the size of your object.
String, a bit longer that twice the width of the bag.
A sewing machine.
Lay your object over the fabric to measure how much you will need:
Fold the fabric and cut a rectangle (twice the size of the bag) leaving at least 4 centimetres around the edges for room. Allow one centimetre for the seams. Allow 4 centimetres for the top.
With your fabric facing down, fold the top over 1 centimetre: pin together.
Repeat on the other side.
Make an other fold of 1.5 centimetres that will form the sleeve for the string and sew.
Fold your bag inside out and now sew the two sides together.
Turn over and push the corners out.
Thread the string through the drawstring sleeve using a safety pin.Knot the string on both sides.
Place your object inside!