I have so much stuff that if it all went on one keyring, it would be too inconvenient to carry in light summer trousers, and it'd weigh too much on the car's ignition. So I have split it into an essentials keyring, which has my actual keys plus a small light, a whistle, the pen and a parachord fob; and an optional keyring, which has a prybaby, small multitool, ferro rod and striker and similar stuff that is heavy, less important or needed less often.
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Quality is addictive.