My checking account has enough to pay the next month's expenses, plus a $500-$1,000 cushion. Savings account has 2-3 months expenses. Taxable account has an extra 3-4 months, not by choice but because I ran out of tax-advantaged space (mustachian people problems).
I also have credit cards with cumulative $50,000 limits, a 401k I can borrow from, a very stable job in a very stable industry and an unhealthy relationship with Costco, so I have at least a month's worth of food at home. (It'd be a lot of lentils, rice and oatmeal, but we'd survive.)
I don't keep any cash at home typically, and carry very very little around. Mostly because between my husband and me we somehow find a way to spend it without remembering, which makes budgeting difficult.