If you are only sending one letter per year, then maybe you should just buy smaller packs, even if they are little more expensive. On other hand you probably have drawers full of useless stuff. Clean out one for things you need, but not very often, like stamps, letters, tape, scissors, etc.

Nail trimmers can live in your bathroom shelf with your soap and shampoo. Then you only need toilet paper, which should be easy to store in any bathroom.

If you need formal shoes often then storing single extra pair (assuming you just have summer and winter shoes, one pair each) isn't a big deal, but more often than not you need formal shoes so rarely that you might as well rent them for the occasion.

Main idea is to get rid of the stuff that doesn't matter and keep only the stuff that does matter and you get use out of. Sure at the moment sink plunger might not give you joy as a thing, but it sure does when your sink clogs.