You've actually got the Big Four listed:
I always go with what I call the Seven Holy Nylons:
Everybody carries these seven. Ya gotta have a pack/buttpack/daypack/hobo sac on a stick, paper bag, etc. You gotta have a shelter/shower curtain/bivy/tent/hammock with tarp. The pad is the only one of the 7 that some few dispense with entirely but not many do in the winter. And everybody wears clothing(I think), and carries food and water. The total weight package always has to include these seven, in addition to boots, ditty bag, books, camera, etc.