Most folks call it the Big Three, with the sleeping system as a combination of the bag and pad, but Big Four is valid, either way.

Pack: 40 oz SD Flex Capacitor 25-40L - overbuilt, but comfy
Shelter: 18 - 22 oz - Gatewood Cape + bivy or net tent
Quilt: 19 - 22 oz - Katabatic quilt or Drop blanket
Pad: 19 oz - Klymit - I like the dimensions, just comfy enough
TOTAL: 96 - 103 oz/ 6# - 6# 7 oz

I think my base weight is somewhere in the neighborhood of 12#, so L, but not UL.