When temperatures plunge and the stakes are high, the Ultralight White Goose Down Envelope Sleeping Bag delivers. Filled with premium white goose down and rated for extreme cold from -10°C to -20°C, this bag is engineered for serious winter camping, high-altitude expeditions, and sub-zero adventures. The integrated hood cap adds critical warmth at the head — the area where most body heat is lost — while the envelope design provides more room to move than a traditional mummy bag. Available in five fill weights — 400g, 600g, 800g, 1000g, and 1200g — and four colour options, you can dial in exactly the insulation level your conditions demand. At 210 × 80 cm, it fits adults up to 1.8 m comfortably, and the splicing zipper lets you connect two bags for a double configuration. Specifications Specification Detail Style Envelope with Hood Cap Filling White Goose Down Shell Fabric Nylon (Water-Resistant) Temperature Rating -10°C to -20°C Season Winter / Extreme Cold Unfolded Size 210 × 80 cm Suitable Height Up to 1.8 m Fill Weight Options 400g / 600g / 800g / 1000g / 1200g Splicing Yes – single or double configuration Applicable Users Adults Available Colors Black, Grey, Red, Blue Black, Red Black Fill Weight Guide 400g: Mild cold — suitable for early winter or high-altitude spring/autumn 600g: Moderate cold — reliable winter camping performance 800g: Serious cold — for consistent sub-zero conditions 1000g: Extreme cold — high-altitude and deep winter expeditions 1200g: Maximum insulation — for the most demanding cold-weather conditions Why Choose This Down Envelope Bag? White Goose Down Fill: Premium natural insulation with exceptional warmth-to-weight ratio — stays lofty and effective in cold, dry conditions. Integrated Hood Cap: Covers the head and neck — the area responsible for the most heat loss — for critical warmth in extreme cold. Five Fill Weights: Match your insulation precisely to your conditions — from mild cold to extreme sub-zero. Envelope Design: More room to move than a mummy bag — better for campers who sleep restlessly or prefer more space. Ultralight Nylon Shell: Durable and water-resistant, keeping the down fill dry and the bag lightweight. I For Extreme winter camping and sub-zero expeditions High-altitude trekking and mountaineering Cold-weather backpacking where warmth-to-weight matters Campers who prefer envelope style over mummy bags Adults needing maximum insulation in a packable format In the Box 1 × White Goose Down Envelope Sleeping Bag with Hood Cap (fill weight & colour as selected) 1 × Compression storage bag