Most stuff sacks are not absolutely necessary. So if you're counting ounces go without. You have weight on one side of the equation and convenience on the other. When one goes up the other goes up too. It just depends on where you draw the line.

Some people protect their gear from water by lining their pack with a trash bag. That protects everything and eliminates the need for lots of little bags.

Those compression sacks with buckles are heavy and bulky. With little more hassle a couple of feet of parachute cord will compress your bag just as well. And you have some cord for other uses.

Lately on multi day trips I simply leave my sleeping bag in my shelter, roll up both together and stuff them in my pack. That eliminates the need for two stuff sacks. It makes packing up much simpler too. But the price I pay is a little more bulk in my pack. Again, it all depends on what your priorities are.