This was my trashcan some time back.I threw away all the junk which I used to kept previously hoping that it might be of some use in future [just in case]. But what I learnt from my experience is that such things are rarely used and when I needed them I could not find them coz I forget where i kept the useful junk.
So the moral of the whole story I let go off the old or else there might not be enough space for new around you.
Now I just throw away any thing that is of no use. I and I dont remember a single thing that I needed among thos I threw away.