What do you keep that no one else uses?

I’ve got a thermos in the toolbox that’s been sitting there since last winter. Not for coffee—too many spills, too much residue. It’s just… warm. The kind of thing that doesn’t get replaced because it still holds heat like it remembers being held. I don’t know why I keep it. But I do. What’s something in your life that’s not functional anymore but you can’t bring yourself to throw out?