Cumulus Panyam 600

The Cumulus Panyam 600 is a four-season winter mummy bag built around 600 g of Polish goose down at 850 cuin fill power (96/4 ratio). Cumulus states a comfort rating of -6 °C and a limit of -13 °C, with an extreme figure of -32 °C; these are manufacturer-rated rather than independently lab-tested, so treat them as a guideline rather than a guarantee. Total weight is 970 g, which is competitive for a bag rated this warm. Down distribution follows a 55/45 split between top and bottom baffles, sending more insulation to where you actually lose heat while lying on a pad, and the differential cut gives the down room to loft fully instead of compressing against the shell. The Pertex Quantum 29 g/m² shell with a DWR finish and trapezoidal baffle construction round out a build aimed at late-autumn and early-winter conditions. It suits hikers and winter campers who need genuine cold-weather margin without the extra bulk of an 850 g-plus expedition bag, though the lack of independent temperature testing means cautious layering is still worth planning for.