I don't remember where, but it was one of those handy/home improvement type shows where one of the rules of thumb for not accumulating too much stuff was to ask yourself how much you really need something if you haven't had it out or touched it in a year. It didn't mean you had to throw it away, just that you needed to pause and think about it.

I've been trying to follow that guideline this year and it's surprising how much we have that exists entirely as "just in case" backups!