Sea to Summit Spark -1C Regular Down Sleeping Bag

Cold nights in the mountains can ruin a good trip. The Sea to Summit Spark -1C Regular is a down sleeping bag engineered to keep you warm when temperatures drop to around freezing. Weighing remarkably little and packing down small, this bag is a go-to for backpackers and campers who value both warmth and space in their pack.

Who is it for

This three-season bag suits solo campers, hikers, and minimalist adventurers. Its mummy cut and high-loft down insulation deliver reliable warmth for spring, summer, and autumn conditions, while the compact packed size leaves room for other essentials.

Main features

• 850+ loft RDS certified ULTRA-DRY Down™ provides excellent warmth and water resistance
• Ultra-light 10D nylon shell and 7D nylon lining keep weight low
• Vertical chest baffles and horizontal lower baffles prevent cold spots
• YKK #3 half-length zipper saves weight and allows easy ventilation
• Mummy shape with 155 cm shoulder circumference offers efficient thermal efficiency
• Comes with Ultra-Sil™ compression sack and storage cell

Specifications

• Comfort temperature: 4 °C
• Limit temperature: -1 °C
• Extreme temperature: -16 °C
• Fill weight: 300 g / 10.6 oz
• Max user height: 183 cm / 6 ft
• Shoulder circumference: 155 cm / 61 in
• Hip circumference: 138 cm / 54 in
• Foot circumference: 88 cm / 35 in
• Packed volume: 3.5 L

Tips

Store the bag loose in its storage cell to maintain loft. When packing for the trail, use the compression sack to reduce volume. Add a liner for extra warmth or to keep the down clean.