I keep plenty of scrap parts and supplies but the only “garbage” I tend to hang on to is large foam padding. I have one that I land the end of my kayak on when I’m getting it off my vehicle roof, one that’s big enough to lay on when I’m working under a car and one that I put under heavy parts when working on the workbench. I have a small stack that I will throw away when I realize I’ll never use them then slowly rebuild when I see one and think “I’ll use that for something.”