The Naturehike SnowBird is built for the moments when the temperature drops below what most sleeping bags can handle. Rated for -10°C to -20°C and filled with 90% duck down at 650FP, this mummy-style bag delivers serious cold-weather performance in an ultralight package. The 20D nylon shell keeps weight to an absolute minimum while providing the durability needed for demanding winter conditions. Available in three sizes — M (190 × 75 cm), L (205 × 80 cm), and XL (220 × 85 cm) — and multiple fill weights from 350g to 1090g, the SnowBird lets you dial in exactly the warmth-to-weight ratio your adventure demands. Whether you’re winter camping, alpine trekking, or pushing into sub-zero terrain, this is the bag that goes where others can’t. Specifications Specification Detail Brand Naturehike Model NH20DY001 (SnowBird) Style Mummy Filling 90% Duck Down Fill Power 650FP Shell Fabric 20D Nylon Temperature Rating -10°C to -20°C Season Spring, Autumn, Winter Size M 190 × 75 cm Size L 205 × 80 cm Size XL 220 × 85 cm Fill Weight Options 350g – 1090g (multiple variants) Splicing Yes – single or double configuration Applicable Users Adults Color Khaki Why Choose the Naturehike SnowBird? 650FP Duck Down: High fill power means exceptional loft and warmth-to-weight ratio — more warmth per gram than lower-FP s. Rated to -20°C: One of the most cold-capable bags in the Naturehike lineup — built for serious winter expeditions, not just cool nights. Featherlight 20D Nylon Shell: Ultralight construction keeps pack weight low without compromising durability in rugged conditions. Three Size Options: M, L, and XL sizes ensure a proper fit for adults of all heights — including taller adventurers up to 220 cm. Multiple Fill Weights: From 350g for shoulder-season use to 1090g for extreme cold — choose the exact insulation level your conditions demand. I For Winter camping and sub-zero expeditions Alpine trekking and mountaineering Cold-weather backpacking in demanding terrain Adventurers who need a bag rated below -10°C Ultralight hikers who prioritize warmth-to-weight performance In the Box 1 × Naturehike SnowBird Duck Down Mummy Sleeping Bag (size & fill weight as selected) 1 × Compression storage bag