Before I started a family, I went through a period of minimalism, and I had a "magic" wallet (card-sized, flips money across on the inside using elasticised bands, doesn't fit coins), and only carried that, my phone and keys. I couldn't collect receipts, lots of store cards, coins, tags or whatever else in it, and it had what I needed (back then).

(separate comments for separate habits, as per the original post)