I suffer from a chronic inability to throw things away if there’s even a slim chance I might need them one day. I’ve developed a system I call “deep freeze”: I take the item, wrap it in food wrap and packaging tape, write what’s inside and the date it was sealed, then add it to the pile of other stuff I’ve put into long-term storage.

This obviously doesn’t help if you literally don’t have the space for it, but in my case it’s more about trying to stay somewhat organized. This way I can forget about it without throwing it away, but also without having to deal with it again.