For me I'd have to say conlanging, I also have a collection of cocktail stirsticks. Back in the day (though some places still do this, most don't obviously), hotels/restaurants/bars/etc all had their own branded stirsticks. Some are really fun, one I think is from a Florida marina and it's actually just a swordfish and the sword/nose is the stirrer part. It's an awesome collection because it's travel related, vintage, functional, unique/individual, and sooooooooo easy to store. Literally just plop them in a cup on your counter by your beverage supplies, they take no room at all.
Not my collection but an example of what they look like: