to keep? to cherish? to toss?

Derek and I are quickly approaching our 1 month mark until we move. It is pretty crazy and has got my head in a frenzy. As we start to think about packing and moving one must wonder what to do with all the crap. What do you keep? What do you toss? What is worth saving in a box forever? Do I keep a t-shirt from the camp I went to that one time 5 years ago? These questions pose highly more difficult and involved when moving overseas to another country. We have to significantly downsize and pretty much sell all of our worldly possessions. This is an okay thought from this side of it but worry it will be quite the reality check when we leave Vancouver with only a car full of stuff. I imagine we will drive away with mostly books and clothes. The more difficult task will arise with wondering what to take to Scotland with us. Do we make extra room in our 2 allowed suitcases for pictures and memories? Or do we just load up with clothes and the necessities? I know people do this all the time so it will work out, but the thought of it all is pretty overwhelming at the time. Let the adventure begin...