I have a Rab Quantum Endurance 800 sleeping bag for sale.
The bags comfort rating is -18C, and it has their weather protective Endurance outer. I bought it for a trip in 2008 which was cancelled, since then it's mainly been sat in my wardrobe in it's cotton storage bag. It's been slept in twice, both times using a silk liner - basically it's in pristine condition. It also comes with it's supplied stuff sac.
Size 215x75x50cm
Fill weight 800g
Fill power 700+ (EU)
Comfort temperature rating -18 deg C
Packed size 25x22cm compressed
Weight of bag 1336g
I'm selling for £250 including postage.