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Sea to Summit
Sea to Summit
Spark SPI

SKU #: pg46346


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Spark SPI
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Product Information


Using 850+ loft goose down treated with the amazing moisture repelling Ultra-Dry Down™, a micro-weight 10D shell and 15D lining, the Spark is an ultra light bag with several key uses. Its balance of size, weight, and warmth make it an excellent summer sleeping bag, especially for cycle touring and ultra-light hiking. Its size and temperature rating allow for use as a booster bag, slipping inside another sleeping bag to add warmth. The protection of Ultra-Dry Down™ makes the Spark ideal for summer alpine use and adventure racing, where heavy weight is not tolerated and where - until now - down has not been a viable option.


  • Ideal for cycle touring, ultra-light hiking, and adventure racing
  • Contoured mummy
  • 55/45 top/bottom differential fill ratio
  • 3D differential cut drawcord hood
  • Sewn through construction
  • Transverse baffles for maximum loft
  • 1/3 length #3 YKK zip minimizes weight and bulk
  • Tapered shaped box foot construction to decrease cold spots
  • Includes XXS 15D Ultra-Sil® compression sack that weighs only 32g, mini storage cell, and small wash bag


WeightRegular: 12.3 oz / 348 g
Long: 13.8 oz / 390 g
Fill WeightRegular: 6.3 oz / 180 g
Long: 7 oz / 200 g
Compression Bag SizeRegular: 1.5L / 4.3 x 4.7 in
Long: 1.6L / 4.3 x 5.1 in
Chest GirthRegular: 57 in / 146 cm
Long: 61 in / 155 cm
Insulation850+ loft Ultra-Dry Down™ (90/10 European goose down)
FabricShell: 10D Pertex® Quantum® treated with DWR
Liner: 15D nylon soft touch, high density weave
EN RatingComfort: 12 C / 54 F
Lower Limit: 8 C / 46 F
Extreme: -5 C / 23 F

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