So what light gear did you experiment with only to go for heavier choices, and why?
For example, my lil' Ti mug goes with me most of the time now since I got it half a year ago or so even though it is the "heaviest" of my light mugs.
Ti mug = 37g
Beer can mug = 28g
Plastic mug = 25g
Taking a mug along with a pot is useful if you like to make a hot drink to go with your food, and if you go with someone else or a group, the mug acts as a small bowl too. When I go without a stove I still take a mug with me, in case I want to boil/warm up a small amount of water on a campfire. It also makes filling up Platypus and Sawyer squeeze bottles much easier at non-moving water sources like lakes, puddles, etc. Also nice to have to wash up to pour water on your body, especially washing hair/head. Finally, a mug is great for collecting wild foods like berries, small mushrooms, greens, etc. And I am sure there are other uses too I can't think of at the moment.
The beer can mug is too fragile and I've already crushed one in the past, plus I don't like (this could just be my own paranoia, have not looked into this in detail) using aluminum because of things I have read/heard about the metal being "bad for you." The plastic mug I can't use on a stove/fire obviously, and same thing goes for plastic about being unhealthy (again, not an expert, just skeptical). Ti of course is quite strong and also non-toxic. No mug at all and I don't get the multiple uses listed above, and to me most of the time the penalty of 37g is well worth it.
Another example is water bottles. I will on occasion bring Platypus bottles, but I usually will go for recycled rigid drink bottles.
1 liter Platy = 25g
750ml Evian bottle = 29g
So okay, the Platy is lighter and more volume... but hard to fill with water at times (unless you have mug ;) ), hard to fit in some backpack water bottle pockets, and annoying to drink from. And 4g is not that big a deal, even I dare say to SUL trips.
So where have you added a bit of weight back to your system?