Biners are great. The little ornamental ones work well as keychains, as they're small enough to fit in your pocket, you can fidget with them and it makes it easy to take keys on and off. For example, in my apartment building, I park underground and have a key that opens the door to the garage from a box on the wall. I don't haeve to turn off my ignition to open it; I just take off the building keys, open the door then pop them back on.
My keychain is just my car keys and keys to my apartment right now, as we use RFID swipe cards at work to get in and out.
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