Sea to Summit Spark Pro -1C Long Sleeping Bag

The Sea to Summit Spark Pro -1C Long is a premium ultralight down sleeping bag designed for three-season backpacking and mountaineering. With a comfort temperature rating of 4°C and a limit of -1°C, it offers exceptional warmth-to-weight ratio. The 850+ loft ULTRA-DRY Down provides reliable insulation even in damp conditions. The mummy shape and vertical chest baffles maximize thermal efficiency while minimizing weight.

Advantages

Ultra-lightweight at only 300g fill weight, packed volume of 3.5L, and water-resistant down treatment ensure performance in variable weather. The 10D nylon shell and 7D nylon liner are durable yet featherlight. YKK #3 half-length zipper reduces weight and snagging.

Suitable for

• Three-season backpacking and hiking
• Ultralight adventures where weight and pack size are critical
• Sleepers up to 198 cm (6'6")

Key specifications

• Temperature Rating (Comfort): 4°C (39°F)
• Temperature Rating (Limit): -1°C (30°F)
• Temperature Rating (Extreme): -16°C (3°F)
• Fill: 95/5 Premium Goose ULTRA-DRY Down, 850+ Loft
• Fill Weight: 300 g (10.6 oz)
• Shell: 10D Nylon
• Liner: 7D Nylon
• Zipper: YKK #3, 1/2 Length, Left Side
• Shape: Mummy
• Max User Height: 198 cm (6 ft 6 in)
• Shoulder Girth: 164 cm (64.5 in)
• Hip Girth: 144 cm (56.5 in)
• Foot Girth: 104 cm (41 in)
• Baffle Construction: Vertical chest, horizontal lower
• Included: Ultra-Sil Compression Sack, Storage Sack
• Packed Volume: 3.5 L

Recommendations

Ideal for minimalist backpackers seeking a high-performance, compressible sleeping bag for spring, summer, and fall conditions. Pair with a sleeping pad for optimal comfort.