Found while cleaning a closet -- a pink plastic rectangle, stamped: THEO. LIPPMAN-STATEWIDE INSURANCE. Inside is an intricately folded plastic rain bonnet, something a woman could carry in her purse in the event of an unexpected shower.

We had dozens of these once upon a time, although I'm not sure if I ever used one for its intended purpose. We also had my grandfather's business stationery, which we used for drawing paper. I still have five or six pieces, yellowed now, although the distinctive red umbrella of The Travelers Insurance Companies still seems bright as ever. And although I'm increasingly anti-clutter -- and, therefore, increasingly less sentimental about what I keep -- I can't imagine discarding this paper I will never use or this rain bonnet I will never wear.

What do you keep for purely sentimental reasons?