Years ago, we tossed all our change into a five gallon water bottle ... remember those, from home coolers? When it filled, we spent days rolling coins. We bought a brand new flat screen TV with it.
Most folks today spend on CC and get no change ... so a separate bank account for 'spare money' makes more sense. In fact we have several accounts for specific payouts. Mortgage is one. Annual payout for insurance, HOI and Vehicles. And one - our favorite - for camping and entertainment. We deposit into each one for the month when the retirement deposits arrive.