Everyones different. I dont need much t.p., maybe go once every 2 days or so on the trail. For a week I just put a very small amt in ziplock. I can actually get by with 1 or 2 wetwipes, but not supposed to put them in mouldering privys.
The Zpacks sacks are going to be the best bang-for-buck to reduce wt I think. The blast foodbag is great, at 0.85 oz, and I have a drysak that I can put my quilt AND clothing in that weighs 0.9 oz. $45 or so is a screaming deal to drop 8oz, you are probably in the range where you are looking at 20-50 /oz to make serious reductions otherwise..
I carry 0.5 oz of sunscreen in a 20ml container. I carried it on many trips, and didnt use any, so I dont bother anymore most of the time. If you have Long sleeves and brimmed hat, you probably wont use it.
I might carry 1 oz natrapel bug dope for about a week +, but only use if ticks are a problem, and then only on legs. Permethrin works great on clothing rest of time. I cant stand smell and nasty feel of deet, etc.
my toothbrush and small amt baking soda weigh less than 0.5oz.
Use a photon freedom headlamp, with spare battery set 0.48 oz.
Never had a need for a packtowel. I wear a bandana around my neck, it keeps neck warm when its cool in evening, protects from sun and bugs, is my pot-lifter, is used to wipe down my tent condensation, and to clean up a bit if need to.etc.