I pack light in like every situation every day. Since the 451 is my daily, all the keys are on it. Yet, all that are on it is my apartment key, my apartment building key, and my mailbox key. Then I have the RFID tag to get into work and a Thorntons card.
The 453 key has nothing but a Qdoba card hanging from it...and the Qdoba card was modified with a velcro pad so I can stick the key to my wine fridge.
They both live in my purse so it's no big deal either way.