If you keep stuff you don't use because of a sentimental attachment, take pictures of it and put it in an album (online is OK) with a note explaining what it was, why you cherished it, and why it should find a new home. That way, you can keep the memory but recycle the item to a new home.
I include a bag when doing laundry. If something is stained too badly, I toss it. If it doesn't fit or I'm not crazy about it, it's in the bag to donate. I don't have to put away anything but what I keep. It saves going through clothes another time.