Years back took to carrying a "Pocket Briefcase". Which is a leather folder for 3x5 index cards with a holder to keep one on the front for lists or making notes. I almost panic when I misplace it.I'm turning into my Dad. He jotted down notes to himself in red felt tip pen. I'm not at "red pen"stage yet but I am writing myself notes while it's on my mind. And yes he also (like me) had a cluttered workshop.