Big 3 Weight - Pack, Shelter, Bag (In our case...backpack, hammock w/ suspension, tarp w/ lines and stakes, top quilt)
Big 4 Weight - Pack, Shelter, Bag, Pad (In our case, just add bottom insulation...this would include everything you need for your basic system, like a SPE if you need it to make your bottom insulaton work.)
Base Weight - Weight of everything you need to carry for a trip, minus consumables. And no luxuries since you don't need to carry those. Base weight includes pack, shelter, top and bottom insulation, kitchen, extra insulation, water and fuel containers (empty), extra clothing (socks, shirts, etc), raingear, 10 essentials not already included (first aid kit, compass, etc), etc.
I always separate the luxuries like notebook and pencil, camera, games, slingshots, etc. It gets tricky for things like tarp tensioners...is that a luxury, or part of your tarp? I'd say stuff like that is really part of your Big 4 since you only use it for your shelter, even though you don't really need them. Same with rings or buckles in hammock suspension...if you've switched to a buckle system, it should be included in your Big 3.
From Skin Out Weight includes your worn gear...this is important b/c some people consider a down jacket "worn gear" but carry a lighter quilt and plan to augment it with their worn jacket. Kind of like cheating if you're comparing your weight to someone else's and omitting a necessary part of the insulation plan. I'd still leave luxuries out if I were comparing to someone else, but I add them in when I'm doing my own trip planning just so I know what I'm carrying.
This is how I define them, at least...obviously there are lots of opinions out there. HOW you define things only matters when you're comparing your weights to others'. And unless they're carrying your pack, that comparison doesn't matter! THAT you define them, in a way that can help you hit your target weight, is what's important.
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