EXCUISTIC 1500

Goose down is generally superior to duck down. I advise you buying goose down minimal 850FP. The Achilles heel of a 3-season sleeping bag is its ability to cope with damp, cold (weather and tent) conditions!!! I contacted Western Mountaineering (WM), Peter Hutchinson Designs (PHD), Helsport, Cumulus Outdoor. Conclusion: as a rule of thumb, the comfort temperature for a 'cold sleeper' is a sleeping bags 'T Comfort' rating minus approx. 10C, in other words if you want feel comfortabel around 0C you need a sleeping bag with -10C 'T Comfort'; I advise you / 'cold sleeper' buy from a manufacturer which ALSO offers: \-an inner sleeping bag (e.g. Cumulus Panyam 600); \-an outer synthetic bag (e.g. Cumuls Polar Overbag for handling damp, cold conditions); \-winter / expedition sleeping bags (e.g. Cumulus Excuistic, Teneqa); \-Overfill, additional overfill; WM good quality, but insufficient expedition sleeping bag supply in Germany, Netherlands, France. PHD good quality, but very expensive, very slow email accessibility. Helsport too few specifications. Buy a sleeping mat with R-value suitable for 0C! I'm in doubt about hydrophobic goose down, because: \-Cumulus Outdoor quote "... For over a decade we’ve used hydrophobic down in many Cumulus® products. Thanks to a special treatment it performs better in damp conditions, holding loft longer and drying faster. ..."; \-WM quote "... Through our own testing, we’ve found that the performance benefits of hydrophobic treatments on high-quality down are often overstated. Premium, untreated goose down naturally contains water-repellent oils — which makes sense, given that geese spend much of their lives in wet environments — and these oils help maintain loft and insulation over time. Hydrophobic treatments tend to wash out much like a DWR and can strip away those natural oils during application, potentially reducing long-term performance. Combined with the strong water resistance of our shell fabrics, we don’t feel hydrophobic down provides a meaningful advantage and, over the lifetime of the product, may actually work against it. ..."; \-PHD quote "... We are currently monitoring the development of hydrophobic downs, in which DWR (Durable Water Repellent) chemical treatments are used as a coating. The idea is that the treatment both slows down water absorption and stiffens the tendrils of the down cluster to increase fill power. However, the longevity of treated down and the speed of deterioration of fill power is a concern to us. High quality, well processed natural downs are actually already very hydrophobic. In addition, we make many of our products in water resistant fabrics to protect the down from condensation found in tents and snow holes. And where necessary, to protect even further, we offer fully taped waterproof shells. ...";

Take a look at cumulus bags. They can do custom fill (up or down, “waterproof” different fabrics etc ) and custom sizing for it as well if you wish. Not cheap but personally I think they’re the best down bags on the market.