It depends. If you have a scanner, you could put all the movie tickets on the glass and scan them, etc. You could pull out the most special letters and keep just a few. I am keeping all the handwritten letters from my grandmother; she is in her nineties now and someday these will be even more precious to me. I think there is a balance between keeping everything and keeping nothing and the balancing place is different for everyone. Sometimes if you are young and/or don't own a home yet, it is tempting to just divest yourself of extraneous possessions. But someday you might feel more nostalgic for the memories these items represent.