Do you find it hard to throw away stuff you don't need?

We talked this morning about having a hard time throwing things away that you don't need. Erin said she pretty much gets rid of stuff that she knows she won't use, but sometimes it's hard to get rid of clothes! I used to be a pack rat but I've gotten a lot better. My girlfriend never throws anything away which is really frustrating so I'm trying to get her to go through stuff and pitch it! Do you have stuff that is hard to throw away?