Closeman is a plastic device that can be used to reseal open boxes and bags including tetrapak, plastic bags, etc., See also www.closeman.com (last checked June 2017).
Closeman can also be used as a clothespin by threading a string through the hole in Closeman and attaching it to a line. Clothing can then be attached to Closeman.
Closeman works for both right and left-handed persons.
Two hands with rather good function are needed to use Closeman as a clothespin; however, it is easy to take down clothing from the laundry line with only one hand, even with compromised function.
This tip is from 2008