I had completely overlooked this part. How do you handle it?

How do you organize everything? I asked asked that parents bring a "supply" bag their first day - change of clothes, diapers, formula and so on...How do you organize this when you have multiple children and do that it's easily reachable when they need a diapers change? I can't imagine just having multiple bags of diapers lying around...that would get hectic and confusing...

What do YOU do?