I attached a key and used it a few times. THE NORTH FACE The North Face Mini Nuptse Jacket This is a mini-sized key holder designed after the popular Nuptse Jacket, a long-selling product from THE NORTH FACE. The ring on the outside can be used as a regular key holder. The buckle on the sleeve can be wrapped around and secured to a backpack or bag's shoulder strap. The fabric is filled with the same padding as the apparel, and the hood is stowable, a design detail that shows great attention to detail.