Abstract: The closing device for a closing and a repeated closing of a bag consists of a strap which is bent to form a loop by a permanent connection. The strap has an inner portion and an outer portion. The inner portion and the outer portion are connected to each other by a design rupture line and a permanent connection. The strap may be opened by partial serving of the inner portion from the outer portion and by folding out the inner portion so that an opening is produced in the outer portion. In order to close the strap again, the inner portion is inserted into the opening in the outer portion.