at this point in my set up, I use two zpacks large rectangulay dry bags and one zpacks stuff sack (which came with the tent).
My lower zpacks dry bag contains:
sleeping bag
mat
pillow
spare clothes
My middle dry bag contains:
ditty bag
ziplocked food stuff
cooking gear
down insulator jacket
Top layer stuff sac contains:
hexamid tent.
My logic is that the top dry bag is the bag I access most during the day, for cooking or whatever…in which I'll probably need to don some insulation anyways (if I am stopping for a meal or tea break), which is why my insulation jacket is found in there also. So this works well. Even though my tent sits on top, it takes up miniscule room, and is easily pulled in and out. Plus, it will be the last thing to be packed after 'packing up camp' in the morning. The bottom dry bag is purely for camp set up in the evening. All up, I think my dry bag configuration weighs in at approx. 3.5 ounces…which is more than acceptable for me.
For dry or warmer camping, I simply use a zpacks pack liner, and chuck the whole lot in…roughly in the same order as I would if using dry bags.
Hope this helps…it works well for me.