Mostly old audio equipment, cables, amps, speakers etc. Paperwork, bills and payslips. Cutlery, I can't throw away shitty old cutlery, but I do use it. I have new cutlery, but I use the old stuff. Travel bags, no matter how old and worn out, as long as it still works I keep it. I do use one of them, but I have about 5.
I had been a terrible hoarder, but I've been getting rid of a lot of things recently, old bits of tools, jars of screws and fixings, old electronics, chargers and computer parts, crappy old furniture, clothes from 20 years ago, university textbooks and work. Stacks of old GW novels, cardboard boxes and packing material. DVDs, old VHS tapes of shit recorded off TV over 20 years ago,
I have been slowly selling a load of old RPG books and the stacks of old GW models that I'll never paint. Made quite a bit of cash on that.