I have a shoe box size container for each parent and both are inside a wooden chest. They mostly contain physical things like diaries from their adolescent and college days (1930s). I figure that is a reasonable amount for anyone to go through some day when I am gone. One huge box of photos went to my brother, the family historian (after we scanned them). It is interesting but when you let go of these memory-filled things from your life, a weight is lifted. The passage of time helps a lot too as their is often some guilt about other's lives lived and how to honor that.