Ultralight Sleeping Bag Naturehike CW700 650FP Duck Down -2°C, 1.3 kg

Ultralight Sleeping Bag Naturehike CW700 650FP Duck Down Ripstop Nylon Hybrid Mummy-Envelope 

Ultralight sleeping bag Naturehike CW700 is a cold-weather down sleeping bag designed for winter camping, backpacking, and mountaineering where low pack weight and reliable thermal performance are required. The bag is filled with 700 g of RDS-certified 650FP duck down (85% down content) and rated to a comfort temperature of -1.7°C (28.9°F) and a limit temperature of -7.9°C (17.8°F), making it suitable for three-season and early winter use. The hybrid mummy-envelope construction combines a mummy-style upper section and U-shaped neck collar for heat retention with a rectangular lower body for freedom of movement during sleep. The outer shell is 20D 400T ripstop nylon with a waterproof finish, and all zippers are YKK. RDS (Responsible Down Standard) certification confirms that the down fill is sourced from animals not subjected to unnecessary harm, providing traceability through the supply chain and verified insulation quality.

Features

• ➤ Hybrid mummy-envelope design: Mummy-style upper with U-shaped neck collar locks in warmth; rectangular lower body allows free leg movement and comfortable sleep position.
• ➤ RDS-certified 650FP duck down: 700 g fill weight, 85% down content, certified under Responsible Down Standard for verified insulation quality and ethical sourcing.
• ➤ Temperature rating: Comfort -1.7°C (28.9°F), limit -7.9°C (17.8°F) — suitable for 0°C environments and early winter conditions.
• ➤ Two sizes: Medium 210 × 75 cm (1.07 kg / 2.37 lbs), Large 220 × 85 cm (1.31 kg / 2.9 lbs).
• ➤ Durable shell: 20D 400T ripstop nylon with waterproof finish and YKK zippers for long-term reliability in wet and cold conditions.
• ➤ Packable: Compresses to Ø20 × 42 cm (Medium) or Ø22 × 42 cm (Large); can be fully unzipped and used as a down blanket.

The CW700 is well suited for multi-day autumn and early winter trips in the Gauja National Park in Latvia, where overnight temperatures regularly drop below 0°C from October onward and ground moisture is a consistent factor in forested camping areas. The 20D ripstop nylon shell with waterproof finish resists condensation and light surface moisture during ground contact, while the U-shaped neck collar prevents cold air ingress at the shoulder zone — a critical heat loss point in mummy bags used in sub-zero conditions. The compact packed size fits into a 45–55 L backpack alongside a three-season shelter and cooking kit without exceeding practical trail weight limits.

Technical Specifications

Materials and Design

• Outer shell: 20D 400T ripstop nylon with waterproof coating — lightweight, tear-resistant, and resistant to surface moisture.
• Insulation: RDS-certified 650FP duck down, 700 g fill, 85% down / 15% feather ratio for consistent loft and thermal performance.
• Construction: Hybrid mummy-envelope — mummy upper for heat retention, envelope lower for sleeping comfort.
• Neck collar: U-shaped design seals the shoulder zone to prevent cold air entry.
• Zippers: YKK full-length zipper allows the bag to be fully opened and used as a blanket.
• Packed form: Compression stuff sack included; packed dimensions Ø20 × 42 cm (M) or Ø22 × 42 cm (L).

About Naturehike

Naturehike is an outdoor equipment manufacturer founded in 2005, producing tents, sleeping bags, backpacks, and apparel distributed across Europe, Asia, and North America. The brand is known for ultralight product lines targeting weight-conscious backpackers and trekkers, with a focus on technical materials and competitive price-to-weight ratios. Naturehike products are widely used in hiking, mountaineering, and cycle touring applications.