Rab Expedition 1000
Yup it's a monster of a sleeping bag! way too warm for most of my trips, but given the bulk of a sleeping bag is primarily from the outer and the zips etc, the additional fill really doesn't add too much to the overall weight or packsize.
This bag is designed for full on expeditions so its again quite roomy.. with enough volume for a big fella wearing clothes and boots if needed. I'm obviously loosing efficiency in having this extra space.. but the upside for me is that I can have the zip open and roll over without an arm or leg being exposed to the air.
Like a lot of the new Rab bags it has targeted fill zones, more fill around the neck and head, chest and feet, but less on the midsection and legs. This is great and quite noticeable as I tend to get prickly legs if i get too hot as I sometimes do in the Crux.
Downsides... the zip does tend to catch if you aren't careful, the material on either side is quite thin and drapey so gets snagged easily. I've never had any damage but its probably only a matter of time.