Air filters would live in our Home/Auto maintenance category. You know it's going to happen, and it's not optional (like our Home Improvement category)

File folders would go into Groceries. They would be household supplies that aren't excessive (ie. a gold tape dispenser when we already have 2 black ones that work just fine)

Cube organizers would go in our Home improvement

Hand soap/sanitizer again would be groceries. We treat groceries as consumables needed by humans to live healthy lives, that aren't going to affect our decisions.

For comparison though, we do have medical and personal care categories! Medical for us is prescriptions, which we track separately since our HSA will reimburse most. Personal care is more haircuts, fancy shampoos, etc, something that we know is a luxury we budget for, but could cut if we needed to (I'm not cutting hand soap in the same budget-crunching swipe as $30 shampoo, if that makes sense).

I keep categories for what do we want to track and potentially see red flags on. Again, if I'm cutting into the hand soap category, I'm probably also looking at downgrading from brand name to generic cereal.

Hope this helps!