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I usually ride with two essentials cases (natch), one with an inner tube, levers, patches and boot or a spare tub (depending if I'm running clinchers or tubs) and one with CC, money, multi-tool, keys, cafe lock, spare hydration tabs.
If I'm riding with a car key, my Audi RS6 Avant key goes on a lanyard around my neck. I've lost an essentials case before, but I've never lost my head. Literally, anyway, rather than metaphorically.
Audi RS6 estate key?