Yes they have, but I wouldn't recommend one, I bought the 3 season one two years back (which they said would go down to -15°c). The temperature didn't even get close to that and I was still too cold. In my opinion, the Quechua Ultralight S5 sleeping bag (at a fraction of the price) is just as good, if not better. Good luck anyways
"...I like to pack like this so the space left is all at the top and easy to access..."
I have a sabre 45 and an Osprey, rather than use a stuff sack I place a heavy duty rubble bag into the pack and then shove the unrolled Osprey into that, I can then push the osprey to the bottom of the pack filling up all the available space down there before closing the rubble bag and shoving the rest of my gear in on top.