A tiny little Sofirn light, about half the size of my little finger, very, very bright, two levels and made from stainless steel- have had other makes, anodised aluminium but they get so scuffed. This still looks new after nearly a year. I do like Sofirn, I have about 8 or 9 of their torches and lanterns, maybe more.
Next is my house keys and, in my pocket, hanging from a lanyard attached to my belt fob is my trusty 1952 British Army Burma pattern penknife with a Sheepsfoot blade, wicked looking can opener and a marlin spike, used to hang my other which didn’t have the marlin spike, then I managed to acquire this one which I now use because they’re so handy for lots of things beside unfastening knots etc.