Spark SpIII 18F

$508.95 - $528.95


Ultralight and super-compact with 850+ ULTRA-DRY Down

The Spark 18F is an ultralight down bag that packs down super-small for fast-and-light shoulder-season trips. The Spark uses premium materials, including ULTRA-DRY Down 850+ Loft Loft, and no-frills design to provide cutting-edge performance for backpacking, bikepacking, and travel. Ultralight does not mean ultra-tight: The Spark sleeping bags are snug but still have adequate girth for the performance-oriented backcountry user.


Brand Name:
Sea to Summit
Temp Rating:
18° F
Seasonal Usage:
Three Season
Temp Rating Celsius:
-8° C
Bag Style:
Fill Weight:
Regular: 15.2 oz / 430 g
Long: 17.1 oz / 485 g
Gray / Yellow
ULTRA-DRY Down 850+ Loft; RDS-certified
Regular: 1 lb 7.5 oz / 665 g
Long: 1 lb 10.3 oz / 745 g
Bag Length:
Regular: fits users up to 6 ft / 183 cm
Long: fits users up to 6 ft 4 in / 192 cm
Circumference at Chest:
Regular: 61 in / 155 cm
Long: 64 in / 162 cm
Circumference at Hips:
Regular: 53 in / 135 cm
Long: 56 in / 142 cm
Circumference at Foot:
Regular: 37 in / 94 cm
Long: 39 in / 100 cm
Bag Shell Material:
10D Nylon
Bag Stuff Size:
4.9L volume when compressed using included compression sack
Other Features:
• ULTRA-DRY Down 850+ Loft 90% Down Cluster Premium Duck Down certified Responsible Down Standard (RDS)
• 10D shell and 7D liner materials help to achieve the incredible lightweight and compact packed size
• Uses a full box baffle construction to accommodate extra down and reduce cold spots
• Expedition mummy bag sizing provides extra space for layered clothing or extra wiggle room
• Vertical baffles in chest optimize position of down and prevent it moving during use
• Zippered draft tube, hood draft collar, and front neck draft collar to prevent heat loss
• Full side zip with two sliders provides easy access and ventilation options
• Updated sizing provides extra room for both shoulders and hips while maintaining insulation efficiency
• Includes lightweight Ultra-Sil™ compression bag and storage cell

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