Ryosaku Aoki designed “Key Keeper” for Japanese design producer +d. It covers an entire key, and prevents your keys from scratching things in your bag or pocket. Another advantage is that it prevents them from making noise when you are carrying several keys.
No need to take out the key from the “key keeper” as the “keeper” automatically slides down when the key is pushed into a keyhole. There are six colors available, so it is easy to tell one key from another. Check out the youtube video here.
