I got a Mont Bell Down-Hugger 3 back when they first came out, about 8-10 years ago now. Weighs ~ 600g and compresses to not much. Below 5c I use a thermolite liner which adds 350g, and usually use thermals as well. I like the modular approach, it means you don't need 2 bags. The Mont Bell has lasted nicely, although it usually loses a feather every time I pack it up