You will need
Piece of fabric 18″ x 42″ (45cm x 107cm) or 2 pieces 18″ x 22″ ( 45cm x 56cm) sewn together.
70″ ( 180 cm) ribbon/tape/cord for drawstring, cut into two equals lengths.
The laundry bag will need to withstand washing temperatures of at least 60degrees
Thread two lengths of ribbon /tape/cord through the channels and knot or sew two lops.