Just thought I'd give a review on my recently purchased Sbag, One Planet Cocoon 500 (reg).
I was going for lightweight warmth. I have tested it by the Mersey at Pine Hut recently where we had heavy overnight frosts, rain & good weather.
PROS
Has compression bag (27.5cmx15cm / 4 litres) which can be compacted down to about 20cmx15cm
Goose down filling 800+ loft
Weighs 831g
Mummy shape
Drawcord at head
Internal pocket
Two hanging tabs on outside at feet to store away
Glow in the dark zip pulls
Anti snag zipper cover
Rated: 0 to -6deg (3/4 season)
V-shaped baffles
Lightweight & compact
After some use in sweaty conditions, no odour (so far!)
No escaping feathers with the Vapour Vent fabric used!
CONS
1/2 zip & no foot zip limits versatility on warmer nights
Down in baffles underneath seem to work away from the centre to outside(result a slightly colder back)
Pull cord at hood hangs in face when gathered
I use a silk liner with this Sbag for extra warmth & to reduce the need to clean. I have been very pleased with it weight & compaction wise. Can get too warm with limited ways to open it up. On the nights with heavy frosts in a tent, I found it took a while to warm up my core body temp after a very cold evening out. It does hug the body well with a mummy shape. Does "feel" damp/cold (but not wet) on top in the mornings but this may have something to do with its type of vapour venting fabric. Priced around $540, it compares well with similar types starting around $700-800.
Cheers
lyndoor