Unfortunately, this product is not described on the article page and also on the photo you can see any details. It was only when I received the article, I have found that you would have to pull a small ring or a hook through the zipper to use. My zips kar have no hole. I also think the length of the cord is too short. Thus, the article is completely useless for me and went back.
Note: The price-performance ratio is not right. You get a 30 cm long cord with a hand strap. At the other end is a hook plus you get 10 small rings. The material price may equal to one tenth of the retail price. Vastly overpriced that you can tinker also himself.