The annoying thing about camping is that it takes as much stuff to camp for one night as it does to camp for several. Unless as Thumbcat says you choose to signifcantly simplify food. Plus of course less clothing.
Yeah that sounds about right. We did it last year with just breakfast stuff and had a pub supper. We took our small cool box with milk and oats. Didn't bother with wash stuff except the toothbrushes, but we are skanky.