I think I have a comfortable minimal stash so that I'm not wasting water, etc washing everyday. I have 12 imagine bamboo pf and a mix of 10 covers (don't always reuse covers), 8 Nanas bottoms aio for faster changes, and 1 wool capris for breath ability (with possibly one pc of wool being added). 20 changes gets me thru washing 3-4 days with a 19 mo old. I love the simplicity!
I admit I have many more diapers but they're all packed away for the next kid. This is what's in rotation after trying a ton.