Have you ever seen that show Hoarders? I have, and I know that these people have a real mental illness, but I use it as a reminder of what could happen if I don't toss stuff.
I'm not a hoarder. I don't think I'm really a pack rat either. My problem is that I keep stuff because "I might need/want it some day", but then 2 years later I look at it and wonder what the hell I was thinking.
I used to do this with old notes from highschool and college. I might "need" my notes from 10th grade history, in case I had a 10th grade history test I needed to take 3 years later. I also used to do this with my son's school work thinking wouldn't it be nice to have this little memory of when he was in kindergarten and wrote his 'e's backwards. Do you know how much crap kids bring home from school? I tossed a lot of things, but it still piles up before I start grabbing handfuls of papers and throwing them in the trash. I have enough drawings of sharks, thank you very much.
Most recently it was moving house. I moved into a 3 bedroom house nearly 2 years ago. I only needed 2 of those bedrooms so I used the 3rd room for storage. Well, my mother was coming to visit so I had to clear out the room. So I'm going through these boxes that have been locked in a room for 2 years and I came to the realization that if I haven't seen it this long, I obviously don't need it. Some of this stuff has been in boxes and storage bins for 4 or more years.
So what did I do with all my junk? I consolidated and hid it all in various closets around the house. Sure I got rid of some old childeren's dvds and a few board games, but the majority of it I kept. What I'm going to do with scraps of paper, nick nacks I don't even like anymore, half finished crochet projects, two (that's 2) Christmas trees and books that I have no desire to read again (but I might want to read them again-but I know I won't), I don't know, but I might need/want them sometime in the future.