I've just about got all of my old pile of nostalgic mementos, documents, etc. down to one full bin, after tossing out a bunch of junk trophies and ribbons and things. I did keep my 8th grade head-stand competition 1st place trophy and driver's ed state trophy, because they're so odd and I think funny to have. They're in the bin, so it's more of a me-joke anyway.
Anyway, I usually go through all of the old junk a few times per year, spending no more than a few seconds on each item, but always linger on the yearbooks for longer. I don't think my young self would recognize me now as the same person, to be honest.
One of my favorite mementos is my pop pop's old pipe (he died in the mid 2000's). It still smells of half-and-half tobacco. Brings back memories.
Sorry if I got a bit off-topic!