Naturehike U350S 650FP Down Mummy Sleeping Bag Right Zip Coffee

Camping in the shoulder seasons demands a sleeping bag that balances warmth, weight, and packability. The Naturehike U350S delivers exactly that: a mummy-shaped down bag filled with 350 grams of 650 fill power white duck down, rated for comfort down to 5°C and limit down to 0°C. The right-side zipper and ergonomic cut suit a wide range of campers up to 180 cm tall, while the 20D nylon shell and lining keep total weight low without sacrificing durability. Whether you're backpacking a highland trail or car camping on a crisp autumn night, this bag compresses to just 19 x 38 cm and slips easily into your pack.

Key specifications

• Type: Mummy sleeping bag, 3-season
• Fill: 90% white duck down, 650 FP, 350 g fill weight
• Temperature ratings: Comfort 5°C / Limit 0°C / Extreme -10°C
• Shell and lining: 20D nylon
• Zipper: Right side
• Dimensions: 205 cm length, 80 cm shoulder width, 50 cm foot width
• Packed size: Ø19 x 38 cm
• Colour: Coffee
• Recommended user height: up to 180 cm
• Construction: H-Box baffle

Why choose it

The U350S stands out for its excellent warmth-to-weight ratio. The 650 fill power down traps heat efficiently, while the H-Box baffle construction prevents cold spots and keeps the down evenly distributed. The mummy shape reduces internal air volume, so your body heats the space faster. The 20D nylon fabric is soft, breathable, and surprisingly tough, and the right-side zipper allows easy entry and ventilation. At just 350 g of down fill, this bag is light enough for multi-day treks yet warm enough for temperatures near freezing.

Ideal use cases

• Backpacking and thru-hiking in spring, summer, and autumn
• Camping in mild to cool conditions (down to 0°C limit)
• Bikepacking and motorcycle touring where pack size matters
• Hostel or hut stays where a compact sleeping bag is required
• Emergency car kit or cabin bedding for unexpected cold nights

Good to know

The sleeping bag comes with a compression stuff sack for easy packing. To maintain loft, store it uncompressed when not in use. The right-side zipper is compatible with left-zipper bags if you want to zip two together. Always air out the bag after use to keep the down fresh. For washing, use a down-specific detergent and follow the care label instructions.