I used to be bad at keeping (useless) items because you never know when you might need them. Then I talked to an older friend of mine who had just cleaned out her elderly mother's house after her death. Her mother had a large house and there was one room that was just full of JARS.
After that, I imagine what people will think of my junk if I should go, when I picture them rolling their eyes and shaking their heads, it's enough to make me throw out the junk.