So I'm loving this Split Ring Key ($7 for two). It's a key with the key chain built right in, so it's easy to slip off of your keychain and onto your finger or shoelaces. Better yet, they come in packs of two, which is handy for anyone who lives in an apartment building that requires two keys. The key blank can be shaped on any key cutter to fit any door lock.
Would you use this? How do you carry your keys when you run?