I know the feeling, when I cleared my old bedroom it too over 20 large black sacks (bin bags whatever you call them in the States).
There is still at least another 10 to go plus dumping the old dressing table, cheap chipboard/plywood unit from the late 60s which served me well from childhood but has to go now. I am also dumping the single bed and turning this box room into an upstairs sitting/TV room where I can invite friends.
/8^)